SPR-17395 ensures that WebFlux.fn is adding a request attribute of type
`PathPattern` on the `HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE`.

A specific tag provider for WebFlux.fn is no longer necessary.

See gh-14876

See gh-14887

Closes gh-14878

Closes gh-14851

Closes gh-14883

* pr/14884:
  Polish

Closes gh-14884

* pr/14836:
  Force JMX hostname to 127.0.0.1

Closes gh-14836

Closes gh-14870

Closes gh-14869

Closes gh-14868

Closes gh-14867

Closes gh-14865

Closes gh-14864

Closes gh-14863

Closes gh-14862

See gh-14412

* pr/14859:
  Polish "Fix a broken table in doc"
  Fix a broken table in doc

Closes gh-14859

See gh-14859

See gh-14857

This commit also restores the `sed` call to sanitize the request body.

Fixes gh-14857

Closes gh-14819