Closes gh-7465

This commit promotes the plugin dependency management for the
`maven-enforcer-plugin` and `maven-invoker-plugin` to the root. That way
these can be used in samples as well rather than having a separate copy.

Closes gh-7517

Closes gh-6563

* pr/7533:
  Polish contribution
  Update doc for spring.data.neo4j.open-in-view

Closes gh-7533

See gh-7533

* pr/7530:
  Polish

* pr/7530:
  Polish

Closes gh-7530

* pr/7527:
  Remove redundant toString() invocation

Closes gh-7527

* pr/7522:
  Fix broken doc formatting

Closes gh-7522

Closes gh-6496

* pr/7491:
  Polish contribution
  Detect default values defined in the parent

Closes gh-7491

Closes gh-5434

This commit adds `@JdbcTest`, a new test slice for pure jdbc tests. It
provides the same basic features than `@DataJpaTest`.

Closes gh-6563

Closes gh-7433

* pr/7510:
  Remove redundant toString() invocation