chore: Remove H2-db leftovers

[vinokurig]

What does this PR do?

fixes the error warning on che-server container start:

WARNING [main] org.apache.catalina.core.NamingContextListener.addResource Failed to register in JMX: [jdbc/che]
	javax.naming.NamingException: Could not load resource factory class [Root exception is java.lang.ClassNotFoundException: org.eclipse.che.core.db.h2.jpa.eclipselink.H2SQLJndiDataSourceFactory]

Screenshot/screencast of this PR

What issues does this PR fix or reference?

fixes eclipse-che/che#23715

How to test this PR?

Deploy che from the pull request image: quay.io/eclipse/che-server:pr-953
See: no errors in the startup logs.

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Release Notes

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[vinokurig]

/retest

[vinokurig]

/retest

[vinokurig]

/retest

[vinokurig]

/retest

[artaleks9]

Verified on Eclipse Che deployed on OCP v4.20 with quay.io/eclipse/che-server:pr-953 - no errors in the startup logs.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: artaleks9, tolusha, vinokurig

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