Update the pipeline YAML to use ((milestone)) rather than ((branch))
when tagging docker images.

See gh-21716

Use YAML anchors and aliases to reduce the amount of repetition
in our CI pipeline YAML.

Closes gh-21716

Closes gh-21774

Closes gh-21777

Closes gh-21814

Closes gh-21813

Closes gh-21812

Closes gh-21811

Closes gh-21810

Closes gh-21809

Closes gh-21808

Closes gh-21807

Closes gh-21806

Closes gh-21805

Closes gh-21804

Closes gh-21803

See gh-21774

See gh-21780

See gh-21777

Closes gh-21729

Closes gh-21728

Closes gh-19293

Previously, the spring bash script added . to the classpath but the
Windows spring.bat script did not. This commit aligns the classpath
of the two scripts by removing . from the classpath in the bash
script.

Fixes gh-19910

Closes gh-15358

Closes gh-21737

See gh-21729

See gh-21728

Closes gh-21681

Closes gh-21596

Restore tests that were previously ignored due to a framework bug.

Closes gh-19702

Update `YamlJsonParser` and `OriginTrackedYamlLoader` to ensure that
custom types cannot be loaded.

Closes gh-21596

Closes gh-21525

Closes gh-21282

Closes gh-21466

Closes gh-21446

Closes gh-20686