Delete the nightly CI run

[david22swan]

All development work has been moved to pdk-private. Nightly run is no longer needed and simply takes upn resources.

Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.52%. Comparing base (eb7d185) to head (e234c35).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1455   +/-   ##
=======================================
  Coverage   88.52%   88.52%           
=======================================
  Files         127      127           
  Lines        5317     5317           
=======================================
  Hits         4707     4707           
  Misses        610      610           

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