test: add mutation-style regression coverage for validation #3401

Job	Run time
doc-anchor-validation	8s
issue-template-label-validation	5s
detect-changes	7s
backend-audit	53s
formatting-hygiene	6s
backend-lint	32s
frontend-run-checks (20)	2m 28s
frontend-run-checks (22)	2m 26s
backend-integration	0s
backend-tests	3s
backend-unit	0s
benchmark	0s
parser-contracts	0s
frontend-checks	2s
	6m 50s

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