chore(priority-alerts): Remove high priority alert condition

[snigdhas]

Cleanup the old high priority alert condition now that existing alerts have been migrated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.82%. Comparing base (da61e5a) to head (afe950f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #70105      +/-   ##
==========================================
- Coverage   79.82%   79.82%   -0.01%     
==========================================
  Files        6504     6503       -1     
  Lines      289378   289333      -45     
  Branches    49834    49825       -9     
==========================================
- Hits       230992   230950      -42     
+ Misses      57975    57972       -3     
  Partials      411      411              

Files	Coverage Δ
...entry/api/endpoints/project_rules_configuration.py	100.00% <ø> (ø)

... and 6 files with indirect coverage changes