Fix linting

[saracope]

Summary

This PR fixes/implements the following bugs/features

• Fix linting issues
• Add lint script to ci

Note: This is an incremental improvement. Some items need further review and so were switched from "error" to "warn" (a backlog card was also created for this)

Deployed to staging for testing.

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AFTER

[CourtneyBrousseau]

🙌🙌🙌

[CourtneyBrousseau]

First of all, wow! Second of all, this all works locally for me as well. I also see the 124 warnings but there are no red errors anymore. npm run test also ran successfully (but still has 1 failing test which I might try to take a look at today).