This commit changes invocations to immediately return the expression
instead of assigning it to a temporary variable. The method name should
be sufficient for callers to know exactly what will be returned.

Closes gh-12211

* pr/12202:
  Polish contribution
  Polish

Closes gh-12202

See gh-12202

* pr/12205:
  Polish

Closes gh-12205

Closes gh-12174

Closes gh-12195

Closes gh-12171

Closes gh-12196

Closes gh-12192

See gh-11994

Closes gh-12190

Closes gh-12183

See gh-12181

Closes gh-12178

Closes gh-12177

Exclude `FileEditor` from the `BindConverter` since it uses slightly
unusual logic to create the file. Specifically, given a value of "."
the editor will locate a `ClassPathResource` then return `getFile()`
from that resource. For back-compatibility, binding should use the
simpler conversion service logic.

Fixes gh-12163

Update `BindConverter` so that delegation to `SimpleTypeConverter` also
works with Collections and Arrays.

Prior to this commit, conversion that relied on a `PropertyEditor` would
only work for simple types. For example, "String -> Class<?>" would use
the `ClassEditor` but "String -> List<Class<?>>" would fail.

The `BindConverter` now uses a minimal `ConversionService` as an adapter
to the `SimpleTypeConverter`. This allows us to use the same delimited
string conversion logic as the `ApplicationConverter`.

Fixes gh-12166

Consistently use `StringUtils.toStringArray`, `ClassUtils.toClassArray`
or zero length when converting collections to arrays.

Fixes gh-12160

* pr/12182:
  Rename TestRestTemplateTestContextCustomizer*

Closes gh-12182

* gh-12172:
  Upgrade to JUnit Platform 1.1.0

Closes gh-12172

This commit ensures that Tomcat is the first reactive server configured
if the Tomcat dependency is on classpath.

Spring Boot chose Reactor Netty as the default for the reactive web
starter, but the Reactor Netty dependency can be used also for its HTTP
client. In case developers are adding Tomcat, Undertow or Jetty on their
classpath, we must configure those and consider Reactor Netty for the
client only.

Fixes gh-12176

Closes gh-12173

* pr/12170:
  Use isTrue() and isFalse() for AssertJ

Closes gh-12170

Closes gh-12162

Update build to add `Automatic-Module-Name` entry to the manifest file.
Also refined a few of the other entries that appear.

Fixes gh-11994

* pr/12156:
  Polish