fix(rbac): Add rights on applicationsets for the application controller

[OpenGuidou]

Upstream fix for: argoproj/argo-helm#2974

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.02%. Comparing base (32cc663) to head (ceb3e65).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20352      +/-   ##
==========================================
- Coverage   55.04%   55.02%   -0.02%     
==========================================
  Files         324      324              
  Lines       55421    55421              
==========================================
- Hits        30504    30497       -7     
- Misses      22303    22308       +5     
- Partials     2614     2616       +2     

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[crenshaw-dev]

I think we probably don't want to do this: argoproj/argo-helm#2974 (comment)

[OpenGuidou]

Updated to clarify the namespaced mode intent in the documentation

[OpenGuidou]

@crenshaw-dev are you ok with the content now ?