Closes gh-25038

* pr/24336:
  Polish 'Add a tip about actuator endpoints'
  Add a tip about actuator endpoints

Closes gh-24336

See gh-24336

Update the "Externalized Configuration" section with a tip that about
the actuator `env` and `configprops` endpoints.

See gh-24336

Closes gh-25020

Closes gh-25028

Closes gh-25013

Closes gh-25018

Closes gh-25027

Closes gh-25014

Closes gh-25017

Closes gh-25022

Closes gh-25019

Closes gh-25016

Closes gh-25021

Closes gh-25015

Update `ConfigDataEnvironmentContributor` to deal with the fact that
the `properties` instance can be `null`.

Fixes gh-25029

Restore the ability to use `spring.config.activate.on-profile` or
`spring.profiles` in profile specific files.

Closes gh-24990

See gh-25002

See gh-24998

See gh-24998

Update `ConfigDataLoader` and `ConfigDataLocationResolver` to support
`DeferredLogFactory` injection.

Closes gh-24988

Closes gh-24994

Attempt to fix cache locking issues by setting a unique `withTestKitDir`
directory for each tested Gradle version.

Closes gh-24993

Closes gh-24975

Closes gh-24737

Closes gh-24973

Closes gh-24970

Update `CompositeHandlerMapping` so that the `usesPathPatterns()` method
returns `true` if any of the delegate mappings return `true`.

Closes gh-24877

See gh-24943

See gh-24943

See gh-24942

Closes gh-24943