chore: update Grafana dashboard.json due to removal of AngularJS support in Grafana

[bhavinkotak]

Due to the removal of AngularJS support in Grafana - this change is updating the Grafana dashboard for ArgoCD to be compliant.

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).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
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• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
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• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.64%. Comparing base (a071f93) to head (734a2ac).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #18964      +/-   ##
==========================================
- Coverage   50.65%   50.64%   -0.01%     
==========================================
  Files         315      315              
  Lines       43286    43286              
==========================================
- Hits        21926    21922       -4     
- Misses      18861    18864       +3     
- Partials     2499     2500       +1     

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[ofaz]

This should close the issue created by Rory : #19027 Upgrade deprecated example dashboard panels