Disallow deleting workflow processes through the API

[kvklink]

Closes #973

[codspeed-hq]

CodSpeed Performance Report

Merging #985 will not alter performance

_{Comparing 973-deny-deleting-wf-endpoint (a0e6110) with main (8d71842)}

Summary

✅ 12 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.37%. Comparing base (8d71842) to head (a0e6110).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #985   +/-   ##
=======================================
  Coverage   84.36%   84.37%           
=======================================
  Files         213      213           
  Lines       10287    10289    +2     
  Branches     1011     1012    +1     
=======================================
+ Hits         8679     8681    +2     
  Misses       1339     1339           
  Partials      269      269           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.