add H2 version of new durable state tests

[pjfanning]

• follow up to fix: postgres durable state schemaName change leads to write errors (#275) #276
• I looked at the SQL files for Oracle, MySQL and SQLServer and think it is best to not mess with them
• My view is to wait for people who want schema support to work for Oracle, MySQL and SQLServer to help in setting up tests, etc.
• afaics MySQL does not differentiate between databases and schemas - https://dev.mysql.com/doc/refman/8.4/en/glossary.html#glos_schema - so probably best to encourage MySQL users just to create extra databases instead of schemas

[pjfanning]

@patsta32 does this look ok to you?

If I have time, I might look at adding schema tests for other pekko-persistence-jdbc use cases - eg journals.

[Copilot]

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Files not reviewed (5)

• core/src/main/resources/schema/h2/h2-create-schema-legacy.sql: Language not supported
• core/src/main/resources/schema/h2/h2-create-schema.sql: Language not supported
• core/src/main/scala/org/apache/pekko/persistence/jdbc/testkit/internal/SchemaUtilsImpl.scala: Language not supported
• core/src/test/scala/org/apache/pekko/persistence/jdbc/state/scaladsl/DurableStateStorePluginSpec.scala: Language not supported
• integration-test/src/test/scala/org/apache/pekko/persistence/jdbc/integration/PostgresDurableStateStorePluginSpec.scala: Language not supported