[BUG] kbcli kb uninstall should not remove kubeblocks from helm repo

[shanshanying]

when we use kbcli kb uninstall to remove kb, it will remove kubeblocks from helm repo list.
It clould be that this repo is added by users on demand. we should avoid doing so.

[shanshanying]

@yipeng1030 PTAL

/cc @wangyelei