Closes #14567

Rework `DevToolsPropertyDefaultsPostProcessor` so that web logging no
longer defaults to `DEBUG`. The post processor now logs an info hint
to suggest the user configure the logging themselves.

Closes gh-14575

Closes gh-14523

See gh-14549

Closes gh-14584

See gh-14522

* pr/14565:
  Add log messages to lines only when the destination isn't set

Closes gh-14565

* pr/14579:
  Add @since in ApplicationContextInitializedEvent

Closes gh-14579

* pr/14582:
  Fix WebSocket web server customizer bean names

Closes gh-14582

See gh-14573

Closes gh-14577

Closes gh-14573

Closes gh-14525

Closes gh-14572

Closes gh-14491

Closes gh-14574

See gh-14489

Closes gh-14571

* pr/14569:
  Polish RabbitMQ properties doc

Fix description for `prefetch`; remove reference to transactions since
the direct container does not support transactionSize.

Also fix `transactionSize` to just reference acks; autoConfiguration
doesn't support enabling transactions.

Closes gh-14569

* pr/14549:
  Polish "Migrate size properties to DataSize"
  Migrate size properties to DataSize

Closes gh-14549

See gh-14549

See gh-14522

Closes gh-14524

Closes gh-14510