Fixes for hibernate/ehcache

[dnlkoch]

Description

This applies several fixes for the hibernate (especially the second-level) cache and the appropriate ehcache configuration:

• add missing cache regions to the ehcache.xml
• update the default application.yml to actually make use of the ehcache.xml (I suppose this change is needed since we updated to Spring Boot 3 and resulted in the logger warnings below)
• make findAllById cacheable (this e.g. used while loading the layers in an application in the GIS client)
• make PublicInstancePermission entities cacheable (this is potentially used in every permission check)

Before:

WARN  org.hibernate.orm.cache.createCache() @108 - HHH90001006: Missing cache[applications] was created on-the-fly. The created cache will use a provider-specific default configuration: make sure you defined one. You can disable this warning by setting 'hibernate.javax.cache.missing_cache_strategy' to 'create'.
INFO  org.ehcache.core.EhcacheManager.createCache() @305 - Cache 'applications' created in EhcacheManager.

After:

INFO  org.ehcache.shadow.org.terracotta.offheapstore.paging.UpfrontAllocatingPageSource.<init>() @149 - Allocating 10.0MB in chunks
09:39:09.734 INFO  org.ehcache.core.EhcacheManager.createCache() @305 - Cache 'applications' created in EhcacheManager.
(…)
INFO  org.ehcache.jsr107.Eh107CacheManager.registerObject() @393 - Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=jar.file./root/.m2/repository/de/terrestris/shogun-config/21.1.3-SNAPSHOT/shogun-config-21.1.3-SNAPSHOT.jar!/ehcache.xml,Cache=applications

Please review @terrestris/devs.

Related issues or pull requests

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Pull request type

• Bugfix
• Feature
• Dependency updates
• Tests
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe)

Do you introduce a breaking change?

• Yes
• No

Checklist

• I understand and agree that the changes in this PR will be licensed under the
  Apache Licence Version 2.0.
• I have followed the guidelines for contributing.
• The proposed change fits to the content of the code of conduct.
• I have added or updated tests and documentation, and the test suite passes (run mvn test locally).
• I have added a screenshot/screencast to illustrate the visual output of my update.

[LukasLohoff]

Nice! 🎉

[ahennr]

🚀

[dnlkoch]

Thanks for the reviews!