chore(root): add eslint a11y plugin

[evenstensberg]

Describe your changes:

Adds a11y to eslint

• [Build] Implement a11y linting to detect violations #7915

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Is this a notable change that will require a special callout in the release notes? For example, will this break compatibility with existing APIs or projects that consume these plugins?

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
• Have you associated this PR with a type: label? Note: this is not necessarily the same as the original issue.
• Have you associated a milestone with this PR? Note: leave blank if unsure.
• Testing instructions included in associated issue OR is this a dependency/testcase change?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
• Appropriate automated tests included?
• Code style and in-line documentation are appropriate?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.14%. Comparing base (2010f2e) to head (60e38aa).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7917      +/-   ##
==========================================
- Coverage   57.67%   57.14%   -0.54%     
==========================================
  Files         677      677              
  Lines       27373    27373              
  Branches     2689     2689              
==========================================
- Hits        15787    15641     -146     
- Misses      11247    11391     +144     
- Partials      339      341       +2     

Flag	Coverage Δ
e2e-ci	62.47% <ø> (+0.50%)	⬆️
e2e-full	23.46% <ø> (-34.68%)	⬇️
unit	49.28% <ø> (-0.08%)	⬇️

see 17 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2010f2e...60e38aa. Read the comment docs.