Build: Nightly test file naming fix

[gmalouf]

Summary

Set CI_E2E_TEST_FILENAME in nightly build.

Test Plan

Run nightlies manually against this branch - test data should publish with correct name.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.85%. Comparing base (be41f15) to head (27e1987).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6426      +/-   ##
==========================================
+ Coverage   50.81%   50.85%   +0.04%     
==========================================
  Files         664      664              
  Lines      111450   111450              
==========================================
+ Hits        56629    56676      +47     
+ Misses      51948    51908      -40     
+ Partials     2873     2866       -7     

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