Add eslint config for libraries/utils

[twschiller]

What does this PR do?

• Add eslint config for libraries/utils
• Current enforces base eslint-config-pixiebrix. There are some rules (e.g., about nullish, etc. that aren't enforced)

Future Work

• Improve lint command naming: https://pixiebrix.slack.com/archives/C080KB9R76G/p1731429258921059. E.g., lint should likely run all checks (instead of having to run lint:full)
• Move main eslint config into the monorepo so we can iterate on configuration sharing across workspaces: https://pixiebrix.slack.com/archives/C080KB9R76G/p1731429207637519

For more information on our expectations for the PR process, see the
code review principles doc

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.81%. Comparing base (8318d74) to head (e02e7b3).
Report is 490 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9506      +/-   ##
==========================================
+ Coverage   74.24%   75.81%   +1.56%     
==========================================
  Files        1332     1413      +81     
  Lines       40817    42769    +1952     
  Branches     7634     7881     +247     
==========================================
+ Hits        30306    32426    +2120     
+ Misses      10511    10343     -168     

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[github-actions]

Playwright test results

 152 passed
 2 flaky
 2 skipped

Details

 Open report ↗︎
 156 tests across 51 suites
 11 minutes, 4 seconds
 e02e7b3
 For more information on how to debug and view this report, see our readme

Flaky tests

msedge-setup › setup/unaffiliated.setup.ts › authenticate with unaffiliated user
chrome › tests/modLifecycle.spec.ts › create, run, package, and update mod

Skipped tests

chrome › tests/runtime/googleSheetsIntegration.spec.ts › can activate a google spreadsheet mod with config options
msedge › tests/runtime/googleSheetsIntegration.spec.ts › can activate a google spreadsheet mod with config options

[fungairino]

This is another one of those things that we can to duplicate for now, but eventually we should move to a top level shared types module

[github-actions]

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