Rename `spring-boot-layertools` to `spring-boot-jarmode-layertools`.

Closes gh-19853

Closes gh-19847

This class was mistakenly marked as deprecated in 2.2.0 instead of deprecated
in 2.3.0. This resulted in the class being deleted as part of the 2.3.0
cleanup.

Putting it back in place now with the correct deprecation noted.

Closes gh-19861

Update all dependencies declarations to use the form `scope(reference)`
rather than `scope reference`.

Prior to this commit we declared dependencies without parentheses unless
we were forced to add them due to an `exclude`.

Replace Gradle single quote strings with the double quote form
whenever possible. The change helps to being consistency to the
dependencies section where mostly single quotes were used, but
occasionally double quotes were required due to `${}` references.

The Spring Cloud Connectors project has been deprecated in favor of the
Java CFEnv project. The Boot auto-configuration and starter that support
Connectors were deprecated in Boot 2.2.

This commit removes the Connectors auto-configuration, starter,
and dependency management.

Closes gh-19798

Closes gh-19792
Co-authored-by: Andy Wilkinson <awilkinson@pivotal.io>

This change ensures that each test in a test suite that shares an
application context gets a unique embedded database, to prevent
inconsistent embedded database state between tests.

Closes gh-16747

Fix a bug in `ExplodedURLClassLoader` and merge the code into the
existing `LaunchedURLClassLoader` class. Also polish a few method
names relating to layer support.

See gh-19848
See gh-19767

Update `AbstractApplicationLauncher` to not attempt to shutdown
the process if startup fails.

Rename the `spring-boot-cloudnativebuildpack` module to
`spring-boot-buildpack-platform` and update the the package
name to `org.springframework.boot.buildpack.platform`.

Closes gh-19851

Change the default `BootstrapMode` for auto-configured `JpaRepositories`
to `BootstrapMode.DEFERRED` to allow the initialization of
`EntityManagerFactory` to be parallelized for increased startup efficiency.

Prior to this change, the default BootstrapMode for all auto-configured
Spring Data repositories was `BootstrapMode.DEFAULT`.

Closes gh-16230

* gh-19850:
  Treat Java 11+'s NoSuchFileException the same as FileNotFoundException

Closes gh-19850

See gh-19850

Closes gh-19652

Add a new `spring-boot-layertools` module which provides jarmode support
for working with layers. The module works with both classic fat jars,
as well as layered jars.

Closes gh-19849

Update the `Launcher` class to allow a packaged jar to be  launched in
a different mode. The launcher now checks for a `jarmode` property and
attempts to find a `JarMode` implementation using the standard
`spring.factories` mechanism.

Closes gh-19848

Update layered jar support so that the name `ext` and any name
starting `springboot` are reserved.

See gh-19767

Update the managed dependencies to include the recently added
`spring-boot-cloudnativebuildpack` module.

See gh-19828

Update `Packager` to create the layer index file when repackaging.

Closes gh-19767

Expand all expression `$` references to the full `${...}` form.

See gh-19841

* pr/19790:
  Polish "Upgrade to Infinispan 10.1.1.Final"
  Upgrade to Infinispan 10.1.1.Final

Closes gh-19790

See gh-19790

See gh-19790

Closes gh-19843

Closes gh-19842

This commit removes references of cache infra following the move to
Micrometer. We no longer ships an infinispan specific binder so the
dependency has been removed as well.

Closes gh-19838

Previously, the generated resources were added as an output to the
main source set. This worked on the command line, but resulted in
the META-INF folder that contains the loader jar not being on the
classpath of downstream projects in Eclipse.

This commit changes loader-tools to add the generated resources
as a srcDir to the main source set. This results in it appearing on
the classpath of other projects in Eclipse that depend on loader-tools
such as the Gradle plugin, thereby allowing its tests to be run in
the IDE as well as on the command line.

Fixes gh-19841

Previously, we were adding dependencies to Ant's ClassLoader within
Gradle. It is suspected that this was causing sporadic loader
contraint violations as types that Gradle itself uses (from Commons
Compress) were then available from two different ClassLoaders.

This commit reworks the Ant smoke test to use JavaExec and Ant's
launcher to run the build. This allows us to make the necessary
dependencies available to Ant in an isolated manner. The javac
invocation within Ant is now forked to allow it to find the tools jar
even when the build itself is running on a JRE.

Closes gh-19839

See gh-19836

* pr/19797:
  Revisit documentation that mentions Gradle "compile" configuration

Closes gh-19797

See gh-19797

See gh-19836

* pr/19826:
  Reinstate running of OutputCaptureRuleTests

Closes gh-19826

See gh-19826

* pr/19835:
  Add UTF-8 encoding to spring-boot-starter-parent POM

Closes gh-19835