Add faithfulness metric #2581

Job	Run time
Lint JavaScript	17s
Lint SCSS / Run Stylelint	16s
CodeQL SAST scan / Analyze	1m 48s
Security Analysis / Run Brakeman	20s
Lint Ruby / Run RuboCop	19s
Test JavaScript / Run Jasmine	33s
Test Ruby / Run RSpec	3m 25s
Lint ERB / Run ErbLint	17s
Dependency Review scan / dependency-review-push	0s
Dependency Review scan / dependency-review-pr	5s
	7m 20s

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