Add --ignore-not-found=true to scaffolded `undeploy` make target

[asmacdo]

Feature Request

While deploying the objects in config/ with kustomize, sometimes it goes wrong (user error) and not all the objects are created. When this happens, make undeploy fails on the first object that doesn't exist. Its easy to work around, just delete them manually. However this interrupts development flow and is a bit annoying.

If we add --ignore-not-found, make undeploy will always try to delete all the objects.

/language go
/language ansible
/language helm

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[camilamacedo86]

It was added to Golang: https://github.com/operator-framework/operator-sdk/blob/master/testdata/go/v3/memcached-operator/Makefile#L118-L120

We still need to update the Makefile for Ansible/Helm and the new Go+Helm plugin.

c/c @asmacdo @fabianvf @varshaprasad96

[camilamacedo86]

/lifecycle frozen

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