fix(ci/proofs): publish the prestates to the right gcloud folder

[theochap]

Description

Fix the kona-proof prestate job by publishing to the right folder

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.3%. Comparing base (fc18e3e) to head (ce592c3).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #18805     +/-   ##
==========================================
- Coverage     76.4%    76.3%   -0.1%     
==========================================
  Files          560      560             
  Lines        53363    53363             
==========================================
- Hits         40799    40761     -38     
- Misses       12418    12458     +40     
+ Partials       146      144      -2     

Flag	Coverage Δ
cannon-go-tests-64	66.4% <ø> (-0.9%)	⬇️
contracts-bedrock-tests	77.6% <ø> (ø)
unit	77.1% <ø> (-0.1%)	⬇️

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see 9 files with indirect coverage changes

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