Allow disabling cert-generator with a Helm value (#4186)

[sjberman]

Cherrypick of #4186

Problem: Need to allow disabling cert-generator with a Helm value.

Solution: Allow disabling cert-generator with a Helm value.

Testing: Allow disabling cert-generator with a Helm value.

Allow disabling cert-generator with a Helm value

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.19%. Comparing base (de35707) to head (7fb116c).
⚠️ Report is 1 commits behind head on release-2.2.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.2    #4280      +/-   ##
===============================================
+ Coverage        86.16%   86.19%   +0.02%     
===============================================
  Files              131      131              
  Lines            14316    14316              
  Branches            74       74              
===============================================
+ Hits             12336    12340       +4     
+ Misses            1777     1774       -3     
+ Partials           203      202       -1     

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