Add faithfulness metric #2619

Job	Run time
Lint JavaScript	15s
CodeQL SAST scan / Analyze	1m 55s
Lint ERB / Run ErbLint	17s
Dependency Review scan / dependency-review-pr	7s
Lint Ruby / Run RuboCop	17s
Test JavaScript / Run Jasmine	48s
Security Analysis / Run Brakeman	22s
Test Ruby / Run RSpec	3m 28s
Lint SCSS / Run Stylelint	18s
Dependency Review scan / dependency-review-push	0s
	7m 47s

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