tests: Run ESLint on tests

[lachlancollins]

• Updated tanstack/config to v0.9, which is a bit more lenient with certain rules (warns rather than errors)

[nx-cloud]

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✅ Successfully ran 1 target

• nx affected --targets=test:format,test:sherif,test:knip,test:eslint,test:lib,test:types,test:build,build --parallel=3

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.57%. Comparing base (5473bb8) to head (7d0c423).
Report is 17 commits behind head on main.

❗ Current head 7d0c423 differs from pull request most recent head 0be8208

Please upload reports for the commit 0be8208 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #793      +/-   ##
==========================================
+ Coverage   91.55%   91.57%   +0.01%     
==========================================
  Files          21       21              
  Lines         900      902       +2     
  Branches      206      205       -1     
==========================================
+ Hits          824      826       +2     
- Misses         71       72       +1     
+ Partials        5        4       -1     

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