Closes gh-15666

See gh-15666

Closes gh-15669

Closes gh-15667

Closes gh-15668

Closes gh-15493

Closes gh-15528

Closes gh-15529

This commit aligns the Spring WebFlux instrumentation on Spring MVC
since gh-12447.
From now on, if the best matching path pattern is not found,
the recorded uri tag will be "UNKNOWN".

Note that for WebFlux.fn, the pattern information is properly
recorded as of SPR-17395.

Closes gh-15609

Closes gh-15594

Similar to what's ben done in gh-15420 for Spring MVC and Spring
WebFlux, this commit adds an outcome tag for the client side on both
`RestTemplate` and `WebClient`.

See gh-15594

Closes gh-15385

This commit ensures that the compression options are also applied on the
`Http2Protocol` when http/2 is enabled with Tomcat.

Closes gh-15591

* pr/15647:
  Polish "Remove redundant throws Exception"
  Remove redundant throws Exception

Closes gh-15647

See gh-15647

* pr/15642:
  Polish "Fix typo"
  Fix typo

Closes gh-15642

See gh-15642

* pr/15645:
  Remove redundant throws Exception

Closes gh-15645

Closes gh-15639