Remove helm charts

[GDYendell]

We can use ioc-instance directly now

https://github.com/epics-containers/ec-helm-charts/releases/tag/5.0.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.03%. Comparing base (83d1610) to head (6b30403).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #251   +/-   ##
=======================================
  Coverage   89.03%   89.03%           
=======================================
  Files          46       46           
  Lines        2280     2280           
=======================================
  Hits         2030     2030           
  Misses        250      250           

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