[WHIT-3439] Harden link-checker-api callback endpoint #18810

Job	Run time
Prettier / Run Prettier	17s
Security Analysis / Run Brakeman	35s
Lint JavaScript / Run Standardx	23s
CodeQL SAST scan / Analyze	2m 15s
Test features / Test features / non-javascript-0	2m 13s
Test Ruby / ruby-only-0	3m 10s
Test JavaScript / Run Jasmine	45s
Test Ruby / assets-required-1	2m 45s
Test Ruby / ruby-only-1	2m 30s
Test features / Test features / non-javascript-2	2m 37s
Test features / Test features / javascript-0	2m 28s
Lint ERB / Run ERB lint	40s
Test Ruby / assets-required-0	2m 25s
Lint Ruby / Run RuboCop	37s
Test features / Test features / non-javascript-1	2m 17s
Dependency Review scan / dependency-review-pr	7s
Lint SCSS / Run Stylelint	20s
Dependency Review scan / dependency-review-push	0s
Test features / Run Cucumber	3s
Test Ruby / Run Minitest	3s
notify-slack-if-failure-on-main	0s
	26m 30s

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