Update flakiness thresholds to reduce number of flakiness::1

Rémy Coutablerequested to merge
update-flakiness-thresholds into main

What does this MR do and why?

This is based on the latest data from #67 (comment 1904228602).

# of flakiness reports Percentile Label
1-12 <= P90 flakiness4
13-36 P90 < x <= P95 flakiness3
37-398 P95 < x <= P99 flakiness2
399+ > P99 flakiness1
Edited by Rémy Coutable

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