Add some more comments and descriptions for HelmRelease CR fields

[mikeshng]

• I have taken backward compatibility into consideration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.80%. Comparing base (211bdbc) to head (0a1a2c3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
+ Coverage   56.76%   56.80%   +0.03%     
==========================================
  Files          68       68              
  Lines       15207    15207              
==========================================
+ Hits         8632     8638       +6     
+ Misses       5713     5707       -6     
  Partials      862      862              

Flag	Coverage Δ
unit	56.80% <ø> (+0.03%)	⬆️

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[xiangjingli]

@mikeshng FYI The e2e test test/e2e/cases/01-placement/ failed. It seems the helm chart was not deployed for some reason. Not sure if it is related to the helmrelease CRD update.

[jc-berger]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jc-berger, mikeshng

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