Switch to controller-runtime server `Runnable`

[trgeiger]

controller-runtime v0.18.x has an exportable http(s) server which we should use in place of the one in catalogd.

Reference PR operator-framework/catalogd#263

[joelanford]

We have bumped up to controller-runtime 0.19 now, so its Runnable server is now something we could import and use. It would enable us to delete our internal/third_party directory.

[github-actions]

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