Update `JarFile` so that `super.close()` is called early so that the
file is not left open. Since we re-implement `JarFile` methods to work
directly on the underlying `RandomAccessDataFile`, it should be safe
to close immediately.

Closes gh-21177

Update `ConfigFileApplicationListener` to throw a better exception if
`classpath*:` is used as a location.

Closes gh-21168

Clsoes gh-20937

Closes gh-21167

Closes gh-21166

Closes gh-21165

Closes gh-21164

Closes gh-21163

Closes gh-21162

Closes gh-21161

Closes gh-21160

Closes gh-21159

Closes gh-21158

Closes gh-21157

Closes gh-21156

Closes gh-21155

Closes gh-21154

Closes gh-21153

Closes gh-21152

Closes gh-21151

Closes gh-21150

Closes gh-21149

Closes gh-21148

Closes gh-21147

Closes gh-21146

Closes gh-21145

Closes gh-21144

Closes gh-21143

Closes gh-21142

Closes gh-21141

Closes gh-21140

Closes gh-21139

Closes gh-21138

Improve "@ConfigurationProperties vs. @Value" documentation with the
recommendation that kebab-case is used with the `@Value` annotation.

Closes gh-20507

Closes gh-21095

Closes gh-21084

Add how-to documentation describing how health information can be
exported to a Micrometer Gauge.

Closes gh-18329

Closes gh-19782

Update `JarURLConnection` to ensure that when connections are opened
a new copy of the JarFile is provided.

Prior to this commit, a single `JarFile` instance was shared which meant
that it could be accidental closed if accessed via
`JarURLConnection.getJarFile()`. If the underlying jar file is closed
then it's possible for a `NoClassDefFoundError` to be thrown if running
on JDK 11 with an active `SecurityManager`.

Closes gh-17796