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a8n: Inject the ChangesetSyncer from enterprise into repo-updater as sub syncer

Administrator requested to merge a8n/enterprise-syncer into master

Created by: mrnugget

This removes the ChangesetSyncer goroutine from ./enterprise/cmd/frontend as planned in https://github.com/sourcegraph/sourcegraph/issues/5678

It does that by injecting a SubSyncer (something that gets run inside the repos.Syncer) constructor into the shared.Main() function both repo-updater binaries call.

This is a first idea of how we can "extend" the open-source version of repo-updater in enterprise without using global hooks.

I'm not entirely sure there's not a better solution possible, but I think this is also fine for a first step.

Happy about any feedback on this!

Thoughts on the constraints and possible other solutions:

Since the complete runtime setup (database connections, http client factories, store, ...) still needs to happens in the open-source version of repo-updater, we cannot pull it out into the enterprise version and then pass things "down" into open-source, which needs to work standalone.

And since right now enterprise and open-source only differ in the "middle part" (how they construct the Syncer), it's hard to see a solution that doesn't inject something without duplicating either the "first" or "last" parts of the Main() function.

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