Added a test case in CitationKeyGeneratorTest.java file #20314

Job	Run time
CHANGELOG.md	12s
Checkstyle	1m 10s
CHANGELOG.md - only unreleased touched	16s
Code coverage	27s
Database tests	1m 6s
Validate Gradle Wrapper	6s
GUI tests	42s
Markdown	4s
Find merge conflicts	5s
Modernizer	43s
OpenRewrite	40s
Validate requirement coverage	27s
Unit tests	42s
Source branch is other than "main"	2s
upload-pr-number	4s
	6m 46s

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