Use lefthook git hook to run linters and guards

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Problem

The monolith recently started using lefthook, a git hook, to perform pre-commit checks. This helps lower cycle times by running linters and also performing some guards prior to running a CI pipeline.

Proposal

Investigate ways lefthook could be used for API Security.

1. Perform linting
   1. yamllint
   2. flake8 (python)
2. Guards
   1. Changed .gitlab-ci.e2e-template.yml, but not .gitlab-ci.e2e-generated.yml

Implementation:

1. Have our hook install/upgrade the needed dependencies to work (zero friction)
2. Add lefthook and create configuration
3. Test on Linux, OS X, and Windows