Fix finalizer removal logic for ingresses

[piyush-tiwari]

Currently, OCI Native Ingress Controller does not remove its guarding finalizer from Ingresses in these scenarios -

• Change of Ingress.Spec.IngressClassName to an IngressClass that is not handled by OCI NIC
• Non-existence of IngressClass corresponding to Ingress.Spec.IngressClassName, possibly because the IngressClass was deleted before Ingresses attached to it were

This fix adds code to remove finalizers in such scenarios, marking the Ingress free to delete as the backing LB resources do not exist.

[coveralls]

Pull Request Test Coverage Report for Build 10072714911

Details

• 3 of 9 (33.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 66.501%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controllers/ingress/ingress.go	0	6	0.0%

Totals
Change from base Build 10002993988:	-0.03%
Covered Lines:	2412
Relevant Lines:	3627

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💛 - Coveralls