Improve dupsigs test stability

Tom Krizek requested to merge 3665-dupsigs-test-stability into main

While I wasn't able to find out the root cause of the behavior described in #3665 (comment 327854), I believe it might be caused due to some CI-specific conditions. This MR should lighten the CI load during the dupsigs test and make it more stable.

Closes #3665 (closed)


I ran these changes in CI on main, v9_18 and executed the dupsigs test in a loop. I haven't seen the issue in any of these runs.

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