Opt-out from "InstallAll" strategy to offload some addons on purpose

[yue9944882]

currently the addon-framework allows developers to automatically install addons to the managed clusters upon discovering new clusters via prescribing InstallStrategy=InstallAll. this is a great feature for fluently installing addons w/o manual operations. however, in some case, a hub admin may want to (1) opt-out from certain addons or (2) just install addons to a selected set of clusters in the first place. for (1) now i have no idea how to uninstall addons even manually. and for (2) i think we can have a new install strategy based on label selection or claim selection.

cc @qiujian16

[yue9944882]

/kind feature

[openshift-ci]

@yue9944882: The label(s) kind/feature cannot be applied, because the repository doesn't have them.

In response to this:

/kind feature

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