[ISSUE 321] Standardize Github Action workflow naming conventions

[daphnegold]

Summary

Fixes #321

Time to review: 3 mins

Changes proposed

Update naming of GA workflows that will be used in PR checks to be clearer.

• Smash front-end checks for linting, testing, format checking and type checking together. They were separate and doing separate npm ci installs for each. Extra time + making PR checks look quite cluttered. If you want to see a specific, you can click on "details" and then expand the section that you're interested in, same as when they were separated.
• Update path naming for API workflow because it was wrong and not getting run.
• Leave FE & API in naming convention for sub-categories of workflows. The reasoning is that when setting up branch protection rules, it makes it easier to find the check you're looking for since you search by sub-category. It does look a bit redundant on PRs, but doesn't bother me, personally. Thoughts? The Github UI here is less than ideal.

[SammySteiner]

This looks great! Thanks for streamlining this 🚀