chore: update changelog with 1.2.0 updates

[patrzhan]

Issue #, if available:

Description of changes:
Update the changelog with v1.2.0 improvements.

Why is this change necessary:
Keep changelog updated

How was this change tested:
N/A

Any additional information or context required to review the change:

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[github-actions]

Unit Tests Coverage Report for aws-greengrass-testing-features

File	Coverage	Lines	Branches
All files	30%	37%	23%	❌
com.aws.greengrass.testing.model.TestContextModel	0%	0%	0%	❌
com.aws.greengrass.testing.model.RegistrationContextModel	0%	0%	0%	❌
com.aws.greengrass.testing.model.ScenarioContext	64%	70%	57%	✅
com.aws.greengrass.testing.model.GreengrassContextModel	25%	25%	0%	❌
com.aws.greengrass.testing.component.RecipeComponentPreparationService$1	100%	100%	0%	✅
com.aws.greengrass.testing.component.LocalComponentPreparationService$1	100%	100%	0%	✅
com.aws.greengrass.testing.component.CloudComponentPreparationService	32%	39%	25%	❌
com.aws.greengrass.testing.component.ClasspathComponentPreparationService	100%	100%	0%	✅
com.aws.greengrass.testing.component.FileComponentPreparationService	100%	100%	0%	✅
com.aws.greengrass.testing.component.CompositeComponentPreparationService	100%	100%	0%	✅
com.aws.greengrass.testing.component.PreparationServiceUtils	10%	10%	0%	❌
com.aws.greengrass.testing.component.LocalComponentPreparationService	59%	56%	63%	❌
com.aws.greengrass.testing.component.RecipeComponentPreparationService	48%	53%	44%	❌
com.aws.greengrass.testing.util.EncryptionUtils	0%	0%	0%	❌
com.aws.greengrass.testing.util.EncryptionUtils$PemWriter	0%	0%	0%	❌
com.aws.greengrass.testing.features.DeploymentSteps	25%	38%	13%	❌
com.aws.greengrass.testing.features.GreengrassSteps	100%	100%	0%	✅
com.aws.greengrass.testing.features.FileSteps$ByteNotation	0%	0%	0%	❌
com.aws.greengrass.testing.features.FileSteps	11%	11%	0%	❌
com.aws.greengrass.testing.features.WaitSteps	55%	73%	38%	❌
com.aws.greengrass.testing.features.IotSteps	44%	44%	0%	❌
com.aws.greengrass.testing.features.IamSteps	0%	0%	0%	❌
com.aws.greengrass.testing.features.AWSResourcesSteps	0%	0%	0%	❌
com.aws.greengrass.testing.features.DeploymentSteps$2	0%	0%	0%	❌
com.aws.greengrass.testing.features.DeploymentSteps$1	100%	100%	0%	✅
com.aws.greengrass.testing.features.NetworkUtilsSteps	0%	0%	0%	❌
com.aws.greengrass.testing.features.DeploymentSteps$3	100%	100%	0%	✅
com.aws.greengrass.testing.features.S3Steps	72%	94%	50%	✅
com.aws.greengrass.testing.features.RegistrationSteps	34%	40%	28%	❌
com.aws.greengrass.testing.features.GreengrassCliSteps	36%	56%	17%	❌
com.aws.greengrass.testing.features.LoggerSteps	0%	0%	0%	❌
com.aws.greengrass.testing.features.SystemMetricSteps	0%	0%	0%	❌
com.aws.greengrass.testing.DefaultGreengrass	54%	69%	38%	❌
com.aws.greengrass.testing.modules.HsmParameters	0%	0%	0%	❌
com.aws.greengrass.testing.modules.FeatureParameters	0%	0%	0%	❌

Minimum allowed coverage is 60%

Generated by 🐒 cobertura-action against 60d7cc8

[github-actions]

Unit Tests Coverage Report for aws-greengrass-testing-launcher

File	Coverage	Lines	Branches
All files	65%	76%	53%	✅
com.aws.greengrass.testing.launcher.reporting.StepTrackingReporting	49%	62%	36%	❌
com.aws.greengrass.testing.launcher.utils.CucumberReportUtils	95%	100%	90%	✅
com.aws.greengrass.testing.launcher.ParallelizationConfig	100%	100%	0%	✅
com.aws.greengrass.testing.launcher.TestLauncherParameterValues	0%	0%	0%	❌
com.aws.greengrass.testing.launcher.TestLauncherParameters	100%	100%	0%	✅

Minimum allowed coverage is 60%

Generated by 🐒 cobertura-action against 60d7cc8

[github-actions]

Unit Tests Coverage Report for aws-greengrass-testing-platform-api

File	Coverage	Lines	Branches
All files	40%	30%	49%	❌
com.aws.greengrass.testing.platform.windows.WindowsNetworkUtils	0%	0%	0%	❌
com.aws.greengrass.testing.platform.windows.WindowsPlatform	75%	75%	0%	✅
com.aws.greengrass.testing.platform.windows.WindowsNetworkUtils$1	0%	0%	0%	❌
com.aws.greengrass.testing.platform.windows.WindowsCommands	43%	36%	50%	❌
com.aws.greengrass.testing.platform.macos.MacosNetworkUtils	0%	0%	0%	❌
com.aws.greengrass.testing.platform.macos.MacosCommands	96%	100%	92%	✅
com.aws.greengrass.testing.platform.macos.MacosPlatform	75%	75%	0%	✅
com.aws.greengrass.testing.platform.linux.LinuxNetworkUtils	0%	0%	0%	❌
com.aws.greengrass.testing.platform.linux.LinuxCommands	100%	100%	0%	✅
com.aws.greengrass.testing.platform.linux.LinuxPlatform	75%	75%	0%	✅
com.aws.greengrass.testing.platform.AbstractPlatform	100%	100%	0%	✅
com.aws.greengrass.testing.platform.PlatformResolver	96%	100%	92%	✅
com.aws.greengrass.testing.platform.RemoteFiles	15%	15%	0%	❌
com.aws.greengrass.testing.platform.LocalFiles	61%	71%	50%	✅
com.aws.greengrass.testing.platform.NetworkUtils	0%	0%	0%	❌
com.aws.greengrass.testing.platform.UnixPathsMixin	0%	0%	0%	❌
com.aws.greengrass.testing.platform.UnixCommands	7%	7%	0%	❌
com.aws.greengrass.testing.platform.DevicePredicatePlatformFiles	28%	28%	0%	❌
com.aws.greengrass.testing.platform.NucleusInstallationParametersModel	0%	0%	0%	❌
com.aws.greengrass.testing.platform.Commands	0%	0%	0%	❌
com.aws.greengrass.testing.platform.PlatformFiles	0%	0%	0%	❌

Minimum allowed coverage is 60%

Generated by 🐒 cobertura-action against 60d7cc8

[github-actions]

Unit Tests Coverage Report for aws-greengrass-testing-platform-pillbox

File	Coverage	Lines	Branches
All files	66%	67%	65%	✅
com.aws.greengrass.testing.pillbox.commands.files.Mkdir	87%	90%	83%	✅
com.aws.greengrass.testing.pillbox.commands.files.Exists	100%	100%	100%	✅
com.aws.greengrass.testing.pillbox.commands.files.Find	82%	100%	64%	✅
com.aws.greengrass.testing.pillbox.commands.files.Cat	100%	100%	100%	✅
com.aws.greengrass.testing.pillbox.commands.files.Remove	88%	93%	83%	✅
com.aws.greengrass.testing.pillbox.commands.files.Find$Type	89%	93%	86%	✅
com.aws.greengrass.testing.pillbox.Pillbox	0%	0%	0%	❌
com.aws.greengrass.testing.pillbox.commands.Process	0%	0%	0%	❌
com.aws.greengrass.testing.pillbox.commands.Files	0%	0%	0%	❌
com.aws.greengrass.testing.pillbox.commands.process.Descendants	0%	0%	0%	❌

Minimum allowed coverage is 60%

Generated by 🐒 cobertura-action against 60d7cc8