fetch/pull: fix regression when using targeted fetch in repo containing import-url imports

[pmrowla]

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

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Fixes regression introduced in #8528 (discord context https://discord.com/channels/485586884165107732/485596304961962003/1041260802067415070)

[codecov]

Codecov Report

Base: 94.31% // Head: 94.31% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (e6ed463) compared to base (014a38f).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8551      +/-   ##
==========================================
- Coverage   94.31%   94.31%   -0.01%     
==========================================
  Files         430      430              
  Lines       32830    32830              
  Branches     4581     4581              
==========================================
- Hits        30963    30962       -1     
- Misses       1449     1450       +1     
  Partials      418      418              

Impacted Files	Coverage Δ
dvc/output.py	90.06% <0.00%> (-0.17%)	⬇️

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