Add `variant` parameter to `ImageProcessingChecker` #18714

Job	Run time
Test Ruby / assets-required-0	2m 27s
Test Ruby / ruby-only-1	2m 42s
Lint ERB / Run ERB lint	43s
Lint SCSS / Run Stylelint	21s
Prettier / Run Prettier	17s
Security Analysis / Run Brakeman	27s
Test Ruby / assets-required-1	2m 38s
Test features / Test features / non-javascript-1	2m 12s
Test features / Test features / javascript-0	2m 45s
Lint JavaScript / Run Standardx	25s
Test features / Test features / non-javascript-0	2m 9s
Lint Ruby / Run RuboCop	31s
Dependency Review scan / dependency-review-pr	5s
Test Ruby / ruby-only-0	3m 23s
Test features / Test features / non-javascript-2	2m 28s
CodeQL SAST scan / Analyze	2m 21s
Test JavaScript / Run Jasmine	43s
Dependency Review scan / dependency-review-push	-1s
Test features / Run Cucumber	4s
Test Ruby / Run Minitest	3s
notify-slack-if-failure-on-main	0s
	26m 43s

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