fix: proto lint

[aaronc]

Description

This resolves issues with proto lint introduced in #700. It also renames the ProjectSequence.project_id field to class_id - an issue that was identified in most merge review.

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #709 (a73d11e) into master (6699a38) will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #709      +/-   ##
==========================================
- Coverage   74.90%   74.74%   -0.17%     
==========================================
  Files         117      118       +1     
  Lines       19497    19542      +45     
==========================================
+ Hits        14605    14606       +1     
- Misses       3918     3963      +45     
+ Partials      974      973       -1     

Flag	Coverage Δ
experimental-codecov	74.84% <ø> (-0.07%)	⬇️
stable-codecov	67.69% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.