Allow application sync by project name

[kamil-wojcik]

Summary

It would be useful to allow argocd application sync via project name

Motivation

In my case I would like use call argocd app sync with some arguments that would sync all alls in given project.

Currently it is

Proposal

There are two ways I think it could be done.

1. Add project label to each application based on the project it belong to so eg. argocd.argoproj.io/project=myproject.
   It could be automatically assigned by argocd.
   that way to sync project it would be matter of calling argocd app sync -l argocd.argoproj.io/project=myproject
2. Add explicit argument to argocd app sync -p myproject. This would be same as for argocd app list -p myprject

[chetan-rns]

@kamil-wojcik There is an open PR #8343 for this feature

[jessesuen]

Duplicate of #8320