Closes gh-14296

This commit harmonizes metrics test to rely on `MetricRun.simple()`
rather than configuring a simple `MeterRegistry` manually. Rather than
applying related auto-configurations automatically, `MetricsRun` only
enable the absolute minimum.

See gh-14255

Closes gh-14294

* pr/14234:
  Polish "Align max HTTP header size configuration"
  Align max HTTP header size configuration

Closes gh-14234

See gh-14234

* pr/14293:
  Polish

Closes gh-14293

See gh-14293

* pr/14291:
  Use InvalidEndpointRequestException for MetricsEndpoint

Closes gh-14291

Closes gh-14278

Closes gh-14290

See gh-14285

* pr/14251:
  Throw an exception on invalid syntax in SPRING_APPLICATION_JSON

Closes gh-14251

* pr/14285:
  Polish "Fix WSDL locations condition to work with a list"
  Fix WSDL locations condition to work with a list

Closes gh-14285

See gh-14285

* pr/14284:
  Fix indent of Jolokia maven dependency declaration in doc

Closes gh-14284

* pr/14271:
  Polish

Closes gh-14271

See gh-14271

* pr/14274:
  Fix typo

Closes gh-14274

See gh-14227

Closes gh-14258