fix(cli): fix app sync --local for apps in non-default app namespaces

[lauren-hinge]

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This is mostly to demo the logic that is missing from within the GenerateManifests call. The request itself does not take an appNamespace, and the server side doesn't handle it either.

A better solution would add the namespace to the request and repo-server handling, but I am not familiar enough with the code here to make those changes. (I also have not tracked down how the actual app server knows how to create the annotation properly).

But, as shown here, it is solveable on the client side, if this is somehow preferred!

Replication steps:

• app in a non-argocd namespace
• local chart it is pointing to
• argocd app sync --local <your path>
• see a SharedResourceWarning, produced by your local sync having sent manifests without the app namespace in the tracking annotation

[lauren-hinge]

just a demo while verifying #17945, closing this assuming it's better fixed on the server side

(it does fix it though! 😁)