fix!: Fix wrong directional check for low is worse metrics

[robinholzi]

Changes

• renamed Percentile > Quantile for more concise naming
• use np.quantile for dynamic quantile thresholds
• adapt and add more tests

[MaxiBoether]

Approving since the test LGTM. Need to think about the details of sorting but we can mergr this already

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.61%. Comparing base (9c42e0f) to head (b3cfa56).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...r/internal/triggers/performance/decision_policy.py	66.66%	1 Missing ⚠️
...supervisor/internal/triggers/performancetrigger.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #633   +/-   ##
=======================================
  Coverage   85.61%   85.61%           
=======================================
  Files         258      258           
  Lines       11333    11334    +1     
=======================================
+ Hits         9703     9704    +1     
  Misses       1630     1630           

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[MaxiBoether]

Thanks (also for switching from percentile to quantile)

[github-actions]

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