Closes gh-26827

Closes gh-26826

Fixes gh-26812

Closes gh-26823

Closes gh-26822

Change `CompositeHealth.getDetails()` to public so that it serializes
correctly when `MapperFeature.CAN_OVERRIDE_ACCESS_MODIFIERS` is
disabled.

Fixes gh-26797

Remove fallback code since we now require Gradle 6.8 and can depend
on the `getMainClass` method being present.

Closes gh-26794

Rename the `derivefrom` method in `ConnectionFactoryBuilder` to
`derivedFrom` to align with `DataSourceBuilder`.

Fixes gh-26810

Fix a bug in `DataSourceInitializationConfiguration` and in
`R2dbcInitializationConfiguration` that was stopping
custom username/password properties from being applied.

Fixes gh-26676

Collapse parameter name and user property into a single column to give
a little more room for the description and default value.

Closes gh-25739

Change the order of `DataSourceScriptDatabaseInitializerDetector` so
that it always runs last. This update allows script initialization to
be combined with a high-level migration tool such as Flyway.

Closes gh-26692

Update `DatabaseInitializationDependencyConfigurer` so that depends-on
ordering is applied based on the `DatabaseInitializerDetector` order.

Prior to this commit, if multiple DatabaseInitializer beans were
detected the order in which they were initialized was not defined.

See gh-26692

See gh-26658

The use of the file's absolute path caused test failures on Windows.

See gh-26682

Closes gh-26682

In our tests, the JNI code in Netty tcNative can cause some of its
classes to be loaded using a ModifiedClassPathClassLoader. When the
wrong class loader is used, SSL-related tests fail, for example due
to the same Netty tcNative classes being loaded by two different
ClassLoders and no longer being the same. This appears to be
dependent upon the order in which tests are executed and results in
intermittent test failures.

It looks like this should be addressed in Netty tcNative 2.0.40 which
preloads all of its classes. In the meantime, this commit updates
ModifiedClassPathClassLodaer to ignore Netty tcNative classes so that
they're only ever loaded by the system class loader.

Closes gh-26749

Closes gh-26809

Closes gh-26808

Closes gh-26807

Closes gh-26806

Closes gh-26805

Closes gh-26804

Closes gh-26803

Closes gh-26802

Closes gh-26801

Closes gh-26800

Closes gh-26799

Closes gh-26798

Update `ConfigurationPropertySourcesPropertyResolver` so that calls to
the `DefaultResolver` do not attempt conversion.

Prior to this commit, the delegate resolver was accidentally called
with the target type which could cause a `ConversionFailedException`
to be thrown. We should have always used `Object.class` and let the
`convertValueIfNecessary` method perform conversion.

Fixes gh-26732

7.1-rc-1 deprecates JavaExec's main property in favor of mainClass
which was introduced in Gradle 6.4. This commit updates some tests
to use mainClass rather than main that would otherwise have failed
due to deprecation warnings in their output.

Closes gh-26793

Closes gh-26791

Closes gh-26790

Closes gh-26789

Closes gh-26788