Closes gh-13620

Closes gh-13603

Closes gh-13607

Previously, a NullPointerException would occur when WebFluxTags
attempted to create a method Tag for a request with a non-standard
method.

This commit updates WebFluxTags to use getMethodValue(), which will
never return null, rather than getMethod(), which may return null,
when determining the tag's value for the given request.

Closes gh-13596

Closes gh-11749
Closes gh-12243

* gh-13572:
  Fix typo

Closes gh-13527

Closes gh-11725

Closes gh-13437

Closes gh-13551

* gh-13559:
  Polish “Close Database to reset Connection's auto commit property”
  Close Database to reset Connection's auto commit property

Closes gh-13559

Previously, LiquibaseEndpoint closed the JdbcConnection but did not
close the Database. When using a connection pool, this could leave the
underlying SQL Connection with its auto commit property set to false.

This commit updates LiquibaseEndpoint to close the Database. This
ensures that it resets that Connection's auto commit property to the
value that it had when the Database was configured to use the
Connection.

See gh-13559

Closes gh-4458

Fixes gh-13442

Fixes gh-13535