Add faithfulness metric #2503

Job	Run time
CodeQL SAST scan / Analyze	1m 53s
Lint SCSS / Run Stylelint	19s
Lint ERB / Run ErbLint	14s
Lint Ruby / Run RuboCop	20s
Test Ruby / Run RSpec	1m 36s
Dependency Review scan / dependency-review-pr	5s
Security Analysis / Run Brakeman	22s
Test JavaScript / Run Jasmine	43s
Lint JavaScript	16s
Dependency Review scan / dependency-review-push	-1s
	5m 47s

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