index: fetch: check for changed files

[efiop]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (c5a89dd) 63.43% compared to head (41c6452) 62.99%.

Files	Patch %	Lines
src/dvc_data/index/fetch.py	9.37%	29 Missing ⚠️
src/dvc_data/index/save.py	56.66%	8 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #497      +/-   ##
==========================================
- Coverage   63.43%   62.99%   -0.44%     
==========================================
  Files          61       61              
  Lines        4209     4251      +42     
  Branches      718      725       +7     
==========================================
+ Hits         2670     2678       +8     
- Misses       1393     1424      +31     
- Partials      146      149       +3     

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