Allow one "bubble" in the perf script.

[tjprescott]

See issue #6224, #6218 and PR #6426.

We have a "perf bubble" in the CLI that, depending on the PR, moves between modules. Rather than chasing it by changing the threshold, this script allows one small bubble (<30 ms load time) to still pass, regardless of which module it is in. The second detected bubble will fail the script.

This should be a more stable workaround until the underlying cause is identified.

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[codecov-io]

Codecov Report

Merging #6470 into dev will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff         @@
##           dev   #6470   +/-   ##
===================================
  Coverage    0%      0%           
===================================
  Files       11      11           
  Lines      133     133           
  Branches     9       9           
===================================
  Misses     133     133

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