[dockerobserver] incorporate EndpointsWatcher and fix startup bug #11541
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Description:
Adding a feature - These changes move the docker observer to include the existing observer.EndpointsWatcher functionality in preparation for supporting multiple subscribers. They also fix a bug that prevented existing containers from being reported as endpoints at startup.
edit: I've updated this PR to remove its redundant logic from what's available in the internal docker client helper.
Link to tracking Issue: #10830
Testing: updated existing tests for functional changes
Documentation: changelog update