feat: Web Validator Client Display Errors

[KClough]

Summary

Closes #1370

• Refactor upload methods
• Handle errors better

Expected behavior

• Unified upload process should work at least as well as it did before for both URL- and file-based uploads
• The following failures should now show feedback in the UI:

Failed to get a job ID from the server

Failed to PUT the file

Failed to check for a report (other than expected 404 while waiting)

Failed to fetch local RULES.md

Checklist

• Run the unit tests with gradle test to make sure you didn't break anything
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

Notes

This branch is based on https://github.com/MobilityData/gtfs-validator/tree/master which used to be the feat/web branch in the Jarvus fork, hence all the extra commits.

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1425 sources (~0 %) are corrupted.
Commit: 33144a8
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1425 sources (~0 %) are corrupted.
Commit: 7edc69c
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[davidgamez]

LGTM!

[isabelle-dr]

Looks like we can merge this one after this suggestion is solved! cc @KClough

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1425 sources (~0 %) are corrupted.
Commit: 10c0e83
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.