Closes gh-26735

Closes gh-26734

Closes gh-26733

Closes gh-26727

Closes gh-26725

Closes gh-26724

Previously, LoggingSystem#get would chose Logback by the sole presence
of a class in logback-core, with the assumption that logback-classic is
also on the classpath. An app that only had the former would therefore
fail.

This commit updates the condition to check for a class in
logback-classic instead.

Closes gh-26711

Closes gh-26717

Closes gh-26716

* pr/26713:
  Remove redudant space

Closes gh-26713

See gh-26713

Closes gh-26703

Closes gh-26702

Update `ImageName` and `ImageReference` to use distinct regex patterns
to parse specific parts of the value. Prior to this commit a single
regex pattern was used which could hang given certain input strings.

Fixes gh-23115

Closes gh-26701

Closes gh-26700

Closes gh-26469

Closes gh-26697

Closes gh-26696

Closes gh-26592

Closes gh-26695

Rename the now public constant for consistency with the JavaPlugin.

See gh-26686

Closes gh-26687

Change `SpringBootPlugin.PRODUCTION_RUNTIME_CLASSPATH_NAME` from package
private to public so that it can be accessed in user build scripts.

Fixes gh-26686

This reverts commit 3f858ed8
since the test already existed.

Closes gh-26679

* pr/26677:
  Test optional directories without sub-directories
  Fix "Allow optional directories without sub-directories"

Closes gh-26677

Add an additional test to ensure that optional wildcard
directory patterns do not fail.

See gh-26677

Fix the update to `resolvePatternEmptyDirectories` introduced in
commit 01dd68e2 which was incorrectly checking `isOptional`.

See gh-26677

Update `ApplicationAvailabilityBean` so that state change logging is
at DEBUG rather than INFO.

Fixes gh-26624

Fix `DataSourceBuilder` so that the type used to access `deriveFrom`
properties is based on the actual instance type rather than the
user-defined type which could have been changed.

Fixes gh-26644

Update `DataSourceBuilder` so that the `driverClassName` may be optional
and silently ignored if it set but the underlying type does not have
a getter/setter.

This restores Spring Boot 2.4 behavior.

Fixes gh-26631
Co-authored-by: Phillip Webb <pwebb@vmware.com>

Update `DataSourceBuilder` so that setters are not longer called for
`null` values. This restores Spring Boot 2.4 behavior.

Fixes gh-26633
Co-authored-by: Phillip Webb <pwebb@vmware.com>

Update `DataSourceBuilder` so that the url property attempts both
`getUrl()` / `setUrl(...)` and `getURL()`/`setURL(...)`.

Fixes gh-26647
Co-authored-by: Phillip Webb <pwebb@vmware.com>

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

Fixes gh-26676

See gh-26654