Add provider specific cnameFlattening Trigger #4134
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What does this PR do?
Add provider specific cnameFlattening Trigger.
Motivation
To enable cnameFlattening only for a specific provider. But keep global if needed. Theoretically, it should only be enabled for a specific service.
This addressing PR #3403, by default when cnameFlattening is enabled, it will check for all route. After some thinking again, although the record is being cached, it should not necessarily check all service.
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Additional Notes
If approved, then traefik-extra-service-fabric need to be updated as well.
Re add from PR #3843