fix hydra_sweeps referenced before assignment

[dberenbaum]

Queuing without overrides is broken due to referencing hydra_sweeps before assignment. Feel free to suggest a different place for the added test.

[daavoo]

My bad in #8521 🙏

[codecov]

Codecov Report

Base: 94.25% // Head: 94.32% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (4703136) compared to base (69f78d3).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8530      +/-   ##
==========================================
+ Coverage   94.25%   94.32%   +0.06%     
==========================================
  Files         431      431              
  Lines       32825    32826       +1     
  Branches     4582     4582              
==========================================
+ Hits        30940    30962      +22     
+ Misses       1466     1445      -21     
  Partials      419      419              

Impacted Files	Coverage Δ
tests/func/experiments/test_set_params.py	100.00% <ø> (ø)
dvc/repo/experiments/run.py	97.50% <100.00%> (+2.62%)	⬆️
dvc/repo/experiments/queue/celery.py	89.47% <0.00%> (+4.30%)	⬆️
tests/unit/repo/experiments/conftest.py	94.33% <0.00%> (+5.66%)	⬆️
tests/func/experiments/test_queue.py	100.00% <0.00%> (+12.90%)	⬆️

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