Remove no longer required integration tests project. Samples can
now be called as part of the build since the maven plugin is no
longer an extension.

Issue: #54393078

(Might remove this later but getting ready for a release)

The problem this change fixes is that spring.main.sources would always
be bound to SpringApplication.sources when provided in a properties file
even if SpringApplication.run() is called directly with sources. This
led to confusion with users saying that their sources were not working
where in fact they weren't even being used.

There would be more than one way to approach this problem, but we
have chosen for now to ignore spring.main.sources completely
if the SpringApplication constructor was already called with
explicit non-empty sources. It might be preferable, if possible,
to only ignore its value in an external properties file (allowing
command line or System properties to override). If we want to change
the behaviour again, I suggest a new story should be created.

[Fixes #54185750] [bs-255]

* Added additional search in
AbstractEmbeddedServletContainerFactory.getValidDocumentRoot() to
detect a /WEB-INF/ directory in the code archive
* If the code archive is in /WEB-INF/** then we assume it is
safe to serve content from / (exposes the loader classes
but nothing sensitive from the app)

[Fixes #54345578]

Add gradle example builds to spring-boot-sample-tomcat and
spring-boot-sample-traditional.

Issue: #53129653

Develop gradle plugin that can repackage JAR/WAR archives so that
they can be launched using 'java -jar'

Issue: #53129653

Issue: #53129653

Issue: #53129653

Fix compression of existing jars to detect nested zip entries and
use the STORED method.

Also fixed various test errors.

Issue: #53129653

Issue: #54228642

Revert welcome file default that break existing tests.

Issue: #54228642

Issue: Issue: #53129653

* For a jar deployment add classpath:static/index.html
(works via Spring MVC mapping)
* For a war the same thing works, but so does adding
index.html to src/main/webapp (works via container
default servlet)

[Fixes #54092261] [bs-252]

Create spring-loader-tools containing utilities that can be used
with both Maven and Gradle plugings.

Refactored existing Maven plugin to use the new project.

Issue: #53129653

Issue: #54095231

Issue: #54095231

Issue: #54095231

* actuator -> boot-ops
* cli -> boot-cli
* launcher -> boot-load
* autoconfig -> boot-config
* bootstrap -> boot-strap
* starters -> boot-up

[#54095231] [bs-253] Refactor Zero->Boot

[Fixes #53027833]