Add back an dvc ignore test

[karajan1001]

Original from
#8767 (comment)

• ❗ I have followed the Contributing to DVC checklist.

• [] 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

Thank you for the contribution - we'll try to review it as soon as possible. 🙏

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f1ea64c) 92.92% compared to head (9b9ea29) 92.92%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9134   +/-   ##
=======================================
  Coverage   92.92%   92.92%           
=======================================
  Files         456      456           
  Lines       36811    36811           
  Branches     5311     5311           
=======================================
  Hits        34207    34207           
  Misses       2081     2081           
  Partials      523      523           

Impacted Files	Coverage Δ
tests/unit/test_ignore.py	100.00% <ø> (ø)

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[efiop]

Thank you! 🙏

[dberenbaum]

Thanks @karajan1001!