[WIP] Add watch filtering by package-id label (obsolete)

[karlkfi]

go/config-sync-watch-filter

Dependencies:

• https://github.com/GoogleContainerTools/kpt-config-sync/pull/1199
• https://github.com/GoogleContainerTools/kpt-config-sync/pull/1204
• https://github.com/GoogleContainerTools/kpt-config-sync/pull/1241
• https://github.com/GoogleContainerTools/kpt-config-sync/pull/1244

TODO:

• Extract SyncStatusUpdater changes
• Extract conflict handler changes
• Finalize design approval (some open questions about label naming)

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[karlkfi]

This PR is replaced by https://github.com/GoogleContainerTools/kpt-config-sync/pull/1301, which has less tech debt in it. But I'm going to keep this one open and blocked for a bit so I can mine it for refactoring to do after watch filtering merges.