Force initialization of KeyManager on startup

[nscuro]

Description

Forces initialization of KeyManager on startup.

Voids the need for a separate secret key initializer in Docker Compose setups (i.e. https://github.com/DependencyTrack/hyades/blob/348e2c06f901de5b644abb03c863ad546f4894a0/docker-compose.yml#L350-L357), since KeyManager will generate it.

KeyManager was previously only initialized in AlpineServlet (https://github.com/stevespringett/Alpine/blob/7f58a627ed8b476dd780e8b8a1aea14d5a848d7b/alpine-server/src/main/java/alpine/server/AlpineServlet.java#L58-L59), which is not loaded when init.and.exit is enabled.

Also reduce log noise when init.and.exit is enabled.

Addressed Issue

N/A

Additional Details

N/A

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have updated the migration changelog accordingly
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.03% (target: -1.00%)	❌ 18.18% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a3d83f7)	21977	18161	82.64%
Head commit (f767c93)	21986 (+9)	18161 (+0)	82.60% (-0.03%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#932)	11	2	18.18%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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