Allow users to template and render Application's resources fully locally

[Sergey-Kizimov]

This PR is an attempt to make the argocd app manifests command run completely local, a pre-rendered file with app objects is required for correct operation.
I hope, this PR should close #11129

example command run:
argocd app manifests my-app-name --local-app-manifest /repo/my-app/application/my-app.yaml --local /repo/my-app/manifests --local-repo-root /repo/my-app

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