[ci] add `mypy` to as a part of `qa` #1012

Job	Run time
Build deployment artifacts / Build API Lambda function zip artifacts	44s
Configure AWS Credentials / OIDC Auth	10s
Build deployment artifacts / Build RedwoodJS console Docker image	41s
Build deployment artifacts / Build API Docker image	0s
Build deployment artifacts / Build Python Lambda function zip artifacts	24s
Build deployment artifacts / Build website deployment artifact	43s
qa / Lint python	14s
qa / Prepare for QA	32s
qa / Test python code	42s
qa / Lint terraform	16s
qa / Lint JavaScript	1s
qa / Test client-side code	1s
qa / Test api-side code	1s
Publish QA Results	1s
Plan Terraform	1s
Publish Terraform Plan	1s
	4m 32s

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