Closes gh-13586

It's part of TestRestTemplate's contract that it's fault tolerant. This
commit aligns the behavior of `withBasicAuth` with that expectation.

Closes gh-15780

Closes gh-16220

* pr/16115:
  Polish "Check for multiple processors in OnClassCondition"
  Check for multiple processors in OnClassCondition

Closes gh-16115

See gh-16115

* pr/16224:
  Fix typo in logging.group property description

Closes gh-16224

Fixes gh-16014

Prior to this commit, exceptions nested in
`NestedServletExceptions` would not be recorded by the
`WebMvcMetricsFilter`. This commit ensures that exceptions
happening downstream (e.g. happening while writing the response
body itself) are properly recorded.

See https://github.com/micrometer-metrics/micrometer/issues/1190
See gh-16014

Closes gh-13586

* pr/16165:
  Polish "Trim trailing whitespace from spring.server.servlet.context-path"
  Trim trailing whitespace from spring.server.servlet.context-path

Closes gh-16165

See gh-16165

* pr/16213:
  Polish "Fix typo in spring-boot-features.adoc"
  Fix typo in spring-boot-features.adoc

Closes gh-16213

See gh-16213

Closes gh-9068

* pr/16166:
  Polish "Update ambiguous documentation about ConfigurationProperties"
  Update ambiguous documentation about ConfigurationProperties

Closes gh-16166

See gh-16166

* pr/16170:
  Polish contribution
  Add support for Mustache, FreeMarker and Thymeleaf in WebFluxTest

Closes gh-16170

See gh-16170

* gh-16106:
  Drop AnyEdit from Eclipse setup as it is not available over HTTPS
  Update build and setup configuration to use HTTPS

Closes gh-16106

See gh-16106