Allow you to sync local Helm apps. Fixes #2741

[alexec]

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).
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Optional. My organization is added to the README.
• I've signed the CLA and my build is green (troubleshooting builds).

Fixes #2741

Needs back-porting to v1.3

[simster7]

Cheeky little bug

[codecov]

Codecov Report

Merging #2747 into master will increase coverage by 0.54%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2747      +/-   ##
==========================================
+ Coverage   37.77%   38.32%   +0.54%     
==========================================
  Files         156      156              
  Lines       17564    17289     -275     
  Branches      203      229      +26     
==========================================
- Hits         6635     6626       -9     
+ Misses      10106     9839     -267     
- Partials      823      824       +1

Impacted Files	Coverage Δ
cmd/argocd/commands/app.go	1.02% <0%> (+0.16%)	⬆️
controller/appcontroller.go	44.89% <0%> (-1.23%)	⬇️
ui/src/app/applications/components/utils.tsx	46.68% <0%> (ø)	⬆️
ui/src/app/shared/services/projects-service.ts	19.71% <0%> (ø)	⬆️

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