Closes gh-12772

Closes gh-12771

Closes gh-12770

Closes gh-12406

Update `ErrorMvcAutoConfiguration` to use `SimpleEvaluationContext`
rather than `StandardEvaluationContext`.

Fixes gh-12507

Update `JarURLConnection` to apply URL decoding to nested jar entry
names.

Fixes gh-12765

Closes gh-12692

Closes gh-12695

This reverts commit 23892e33.

Closes gh-12734

Previously, ErrorPageFilter's ErrorResponseWrapper would delaying
sending an error back to the client. In cases where the response's
Writer or OutputStream was accessed and flushed or closed, this could
lead to the wrong response status being sent.

This commit updates ErrorResponseWrapper so that it will send any
capture error to the client before returning the response's Writer or
OutputStream. This ensures that closing the Writer or OutputStream
does not cause the response to be committed with the default response
status rather than the previously captured error status.

Such responses will now include the correct status, but will not be
forwarded to the error controller. Such forwarding is not possible
due to the response already having been committed.

Closes gh-11814

Closes gh-12739

Closes gh-12344

Closes gh-12748

Closes gh-12734

Closes gh-12736

Closes gh-12735

* gh-12715:
  Polish "Use modifiable set for @ServletComponentScan with no packages"
  Use modifiable set for @ServletComponentScan with no packages

Closes gh-12715

Previously, when a project contained multiple `@ServletComponentScan`
annotated classes in classpath, and at least one annotation don't
explicitly specify `basePackages` and `basePackageClass` attribute,
the application could fail to start with an
UnsupportedOperationException. The failure occurred due to the
creating of an unmodifiable set when no base packages are configured
and a subsequent attempt to add base packages to that sit.

This commit fixes the issue by removing the use of an unmodifiable set
when `@ServletComponentScan` with no base packages in processed before
any other `@ServletComponentScan` annotations.

See gh-12715

Closes gh-12731

Closes gh-12730

Update `Restarter` to be much more defensive when attempting to clear
caches. We now use `clearCache()` methods whenever possible, and only
fall back to field access when absolutely necessary. In addition field
access now ignore any exceptions.

Fixes gh-12719

See gh-12695

See gh-12692

Closes gh-12526

* pr/12629:
  Polish "Use secure connection to repositories"
  Use secure connection to repositories

Closes gh-12629

See gh-12629

Closes gh-12636

* pr/12535:
  Fix ModifiedClassPathRunner tests if run via IDEA

IntelliJ can shorten the classpath to a single classpath.jar in order to
circumvent errors originating from a too long classpath. This breaks the
filtering inside ModifiedClassPathRunner as the classpath contains only a
single jar to match against. This can be fixed by applying a similar
mechanism already provided for Surefire manifest-only booter JARs, which
extracts the real classpath from the JAR's Manifest file.

See gh-12535

Closes gh-12614

Closes gh-12613

Closes gh-12573

* gh-12554:
  Polish "Use this.out in SummaryProgressReporter.finished()"
  Use this.out in SummaryProgressReporter.finished()

See gh-12554