chore: add missing unit tests for Coder plugin #83

Closed Parkreiner closed 5 months ago

Resolves one of the to-do items in #8

Changes made

Added test file for CoderAuthWrapper
Added test files for all CoderWorkspacesCard sub-components
Deleted all the test helpers for working with components (which hadn't been used up until now), and made a new one
Made various changes while writing out the tests
- Made of the error messages for CoderAuthWrapper more user-friendly
- Updated how the IDs were bound for MUI in CoderAuthInputForm
- Updated our parsing logic for grabbing the name of a repo (helps us support GitLab and Bitbucket better)
Rewrote some of the comments to be more clear

This still isn't all the tests, but to keep things manageable, I decided that I'll handle the main integration test in a separate PR