WIP: Remove Deprecated Metrics

[khrm]

We have given sufficient time to the users to migrate to newer metrics. This PR removes the deprecated metrics. Metrics already exist with Prometheus recommended names.

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The following Tekton test failed:

Test name	Commit	Details	Required	Rerun command
check-pr-has-kind-label	6178159	link	true	/test check-pr-has-kind-label

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@khrm: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-pipeline-beta-integration-tests	6178159	link	true	/test pull-tekton-pipeline-beta-integration-tests
pull-tekton-pipeline-integration-tests	6178159	link	true	/test pull-tekton-pipeline-integration-tests
pull-tekton-pipeline-unit-tests	6178159	link	true	/test pull-tekton-pipeline-unit-tests
pull-tekton-pipeline-alpha-integration-tests	6178159	link	true	/test pull-tekton-pipeline-alpha-integration-tests
pull-tekton-pipeline-build-tests	6178159	link	true	/test pull-tekton-pipeline-build-tests

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[tekton-robot]

@khrm: PR needs rebase.

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