See gh-9280

Previously, when the liquibase.url, .username, and .password
properties were used to configure a DataSource specifically for
Liquibase that DataSource would never be explicitly closed. As it is
created by DataSourceBuilder with no explicitly configured type it
will use whichever connection pool is available and, therefore, will
create and keep open the pool's minimum number of connections. This
is an unnecessary use of resources both in the application and in the
database.

This commit updates LiquibaseAutoConfiguration so that if it uses
DataSourceBuilder to create a DataSource then it will also close that
DataSource once the database has been migrated.

Closes gh-9218

* pr/9212:
  Fix typo in javadoc

Closes gh-9212

Closes gh-9178

Closes gh-9177

Closes gh-9176

Closes gh-9175

Closes gh-9171

Closes gh-9082

See gh-9080

Closes gh-9080

Closes gh-9080

Closes gh-9075

* pr/9065:
  Polish "Clarify and re-organize docs on caching"
  Clarify and re-organize docs on caching

Closes gh-9065

See gh-9065

CachePublicMetrics wasn't explicitly tested and was still using field
injection. This commit improves the situation in preparation of the fix
for gh-8984

Closes gh-8983

Closes gh-9040

Closes gh-9039

Closes gh-9038

Closes gh-9037

Closes gh-9036

Closes gh-9035

Closes gh-9034

Closes gh-9033

`BasicErrorControllerIntegrationTest` is handling the context in each test
and yet it starts a useless test via `@SpringBootTest`. This commit
removes the useless runner and associated annotations.

Closes gh-8938

See gh-8938

This commit reverts 2deab52a as the Couchbase driver must be upgraded from
2.2.x to 2.4.x

See gh-8938

Closes gh-8938

* pr/8935:
  Upgrade to Spring Integration 4.3.9.RELEASE