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Fix race conditions for Azure loadbalancer and route updates #77490
What type of PR is this?
What this PR does / why we need it:
Azure cloud provider configures routeTable and loadBalancer by invoking ARM APIs. But on cluster initialization stage, it may update them even when the create operation from provisioning tools doesn't finish. Because the later PUT would cancel a previous ongoing one, this would introduce troubles for provisioning tools.
This PR fixes race conditions for them by adding ETAG in PUT requests, hence cloud provider won't override the concurrent updates from other components.
Which issue(s) this PR fixes:
Special notes for your reviewer:
Does this PR introduce a user-facing change?:
[APPROVALNOTIFIER] This PR is APPROVED
This pull-request has been approved by: feiskyer
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