index: load meta from outs.files

[efiop]

This is mainly needed for cloud versioning, to ensure that version_id is present for files inside a directory.

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (499c2dd) 90.59% compared to head (be19061) 90.31%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
dvc/testing/remote_tests.py	5.00%	19 Missing ⚠️
dvc/repo/index.py	12.50%	6 Missing and 1 partial ⚠️
dvc/testing/cloud.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10188      +/-   ##
==========================================
- Coverage   90.59%   90.31%   -0.28%     
==========================================
  Files         499      499              
  Lines       37912    37937      +25     
  Branches     5508     5513       +5     
==========================================
- Hits        34346    34264      -82     
- Misses       2924     3009      +85     
- Partials      642      664      +22     

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