Add formatting/linting/ts check in E2E

[rylew1]

Do we want formatting/linting and/or ts:check for writing E2E tests?

See https://github.com/navapbc/pfml-starter-kit-app/pull/229#discussion_r1889273383

Ex: We had no ts:check and had an extra await in code

[rylew1]

@lorenyu i think this needs to be done soon - kind of a pain to work with the growing e2e codebase without have prettier and linting

Do we want a google doc / design doc for this?

[lorenyu]

@rylew1 sounds good to prioritize this. A quick google doc / design doc sounds good. Should answer questions like how it gets set up for developers, when it runs, should it be part of CI and if so what workflow it should be a part of, etc