Add RefChecker logic for reference validation Relates to #13604 #10140

Job	Run time
format	1m 6s
upload-pr-number	4s
Checkstyle	1m 7s
Dependency Scopes	1m 7s
format-javadoc	14s
Markdown	14s
Modernizer	1m 3s
OpenRewrite	1m 6s
CHANGELOG.md - only unreleased touched	37s
Validate requirement coverage	1m 4s
JavaDoc	1m 6s
JBang (PR) (jablib-examples/jbang/ieee_pdf_references_to_bibtex.java)	1m 0s
Unit tests – jabsrv	1m 4s
Unit tests (Windows) - file-based	46s
Validate Gradle Wrapper	9s
JBang (PR) (.jbang/JabSrvLauncher.java)	52s
Database tests	1m 9s
JBang (PR) (.jbang/JabKitLauncher.java)	1m 0s
Unit tests – jabgui	1m 5s
Unit tests – jabkit	1m 6s
CHANGELOG.md	17s
JBang (PR) (jablib-examples/jbang/doi_to_bibtex.java)	53s
Unit tests – jablib	1m 6s
JBang (PR) (.jbang/JabLsLauncher.java)	54s
JabKit Smoke Test	1m 0s
Unit tests (Windows)	0s
Code coverage	0s
publish	0s
Maven examples	0s
JBang (main)	-1s
	21m 8s

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