In general we do not recommend using @PropertySource due to them being
added to the environment too late for auto-configuration to use them. This
commit updates the documentation to mention them in the list of external
sources along with a note.

Closes gh-18900

Closes gh-19026

Closes gh-19124

Closes gh-19123

Closes gh-19122

Closes gh-19121

Closes gh-19120

Closes gh-19119

Closes gh-19118

Closes gh-19117

Closes gh-19116

Closes gh-19115

Closes gh-19114

* pr/19109:
  Polish "Use ssl.enabled flag when RabbitMQ address has no protocol"
  Use ssl.enabled flag when RabbitMQ address has no protocol

Closes gh-19109

There is a direct link between the sslEnabled flag and the default port
that should be used by an address. The checks are currently set in two
places:

* Determine which port should be used
* Determine if SSL should be enabled

This commit polishes the initial proposal so that secureConnection is
only set if a protocol is available.

See gh-19109

See gh-19109

* pr/18873:
  Let Liquibase smoke test pass on non-english systems

Closes gh-18873

See gh-18873

* pr/19057:
  Remove invalid example of spring.mvc.async.request-timout property

Closes gh-19057

See gh-19057

* pr/19027:
  Polish "Fix logging in CloudFoundryVcapEnvironmentPostProcessor"
  Fix logging in CloudFoundryVcapEnvironmentPostProcessor

Closes gh-19027

See gh-19027

See gh-19027

See gh-19072

See gh-19068

See gh-19051

See gh-19068

Fixes gh-18908

Fixes gh-18998

* pr/19028:
  Fix syntax error in configuration metadata sample in docs

Closes gh-19028

See gh-19028

* pr/19008:
  Fix build badge in README

Closes gh-19008

See gh-19008

* pr/19003:
  Consistently use task timeout in CI pipeline

Closes gh-19003

See gh-19003

Closes gh-18842

Previously, when RunProcess handled a SIGINT it would immediately
attempt to destroy the process that it had run. This created a race
condition between the SIGINT being handled by the child process
and RunProcess destroying the child. The exact behavior of destroy
is implementation dependent and it may result in forcible termination
of the process where shutdown hooks are not called. This is what
happens on Windows. The exit code in such a case is 1 which prevents
anything from waiting for the process to complete from detecting
that it ended as a result of a SIGINT, leaving it with no choice but
to report an error. This is what happens with mvn spring-boot:run
with a forked process on Windows and results in the build failing.

This commit updates RunProcess to allow the child process to handle
the SIGINT itself, waiting for up to five seconds for that to happen
before the process is then destroyed. Given this time, the child
process exits with 130 which RunMojo already handles correctly as
indicating that the process died due to SIGINT and the build completes
with success as a result.

Fixes gh-18936

Previously, whitespace in between the keys and values in the JSON was
not trimmed correctly in BasicJsonParser which lead to it incorrectly
parsing JSON with whitespace between the opening of a list ([) and the
opening of a map ({).

This commit updates the parser to trim unwanted whitespace and adds a
test to AbstractJsonParserTests to verify the whitespace handling
behaviour across all JsonParser implementations.

Closes gh-18911