Disable H2 shutdown hook

[nscuro]

Description

Disables H2 shutdown hook.

H2 registers a JVM shutdown hook to close the database upon reception of SIGTERM. However, the hook executes before the servlet context has shut down, so event processing can still be going on at that time, causing a flood of "database already closed" exceptions.

The H2 database is already closed as part of Alpine's PersistenceManagerFactory#contextDestroyed method, thus making the additional shutdown hook of H2 redundant anyway.

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 added corresponding update logic
• 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
✅ +0.00% (target: -1.00%)	✅ ∅ (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (fcbc723)	22251	17080	76.76%
Head commit (da631dd)	22251 (+0)	17080 (+0)	76.76% (+0.00%)

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 (#4106)	0	0	∅ (not applicable)

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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