Add Knapsack for improving test runtime #3869

Job	Run time
Build and push Docker image	4m 37s
Lint / Lint JS	27s
Lint / Lint ruby	1m 9s
Lint / Lint ERB	41s
Lint / Lint SCSS	46s
Run the RSpec tests / Run rspec (6, 0)	8m 47s
Run Brakeman vulnerability scanner / Brakeman Scan	30s
Run the RSpec tests / Run rspec (6, 1)	9m 2s
Run the RSpec tests / Run rspec (6, 2)	9m 0s
Run the RSpec tests / Run rspec (6, 3)	8m 30s
Run the RSpec tests / Run end to end scenarios (15, 0)	6m 54s
Run the RSpec tests / Run rspec (6, 4)	8m 43s
Run the RSpec tests / Run end to end scenarios (15, 1)	7m 34s
Run the RSpec tests / Run rspec (6, 5)	8m 46s
Run the RSpec tests / Run end to end scenarios (15, 2)	7m 27s
Run the RSpec tests / Run end to end scenarios (15, 3)	5m 59s
Run the RSpec tests / Run end to end scenarios (15, 4)	7m 14s
Run the RSpec tests / Run end to end scenarios (15, 5)	6m 50s
Run the RSpec tests / Run end to end scenarios (15, 6)	6m 54s
Run the RSpec tests / Run end to end scenarios (15, 7)	7m 15s
Run the RSpec tests / Run end to end scenarios (15, 8)	7m 7s
Run the RSpec tests / Run end to end scenarios (15, 9)	6m 52s
Run the RSpec tests / Run end to end scenarios (15, 10)	6m 45s
Run the RSpec tests / Run end to end scenarios (15, 11)	6m 57s
Run the RSpec tests / Run end to end scenarios (15, 12)	6m 49s
Run the RSpec tests / Run end to end scenarios (15, 13)	7m 0s
Run the RSpec tests / Run end to end scenarios (15, 14)	7m 12s
Run Smoke tests	0s
Deploy review	2m 53s
Permit merge	7s
Deploy staging	0s
Deploy production	0s
Deploy sandbox	0s
	2h 48m 47s

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