fix: return error on interface not found and always clean up snat ep #3226
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Reason for Change:
If the interface is not found when querying for it in AllowHostToNC or vice versa, the error is ignored, leading to a potential panic if we try to access the interface (which would be nil). This PR checks the error and returns it if it is not found, avoiding the panic. Additionally, if there is a failure in deleting one of the interfaces for an endpoint, this PR will still attempt to clean up associated snat interface (previously an error during the cleanup process would cause the snat endpoint not to be cleaned up).
Issue Fixed:
Requirements:
Notes:
Green run: https://msazure.visualstudio.com/One/_build/results?buildId=109439035&view=results