🐛 fix generate command not respecting --namespaced=false of APIs

[antonincms]

Change the getAPIResourceFlags function to return --namespaced=false if resource.API.Namespaced and add corresponding test.
This is needed since currently kubebuilder alpha migrate always create namespaced APIs due to the default of namespaced being true.

Fixes #3969

[k8s-ci-robot]

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[camilamacedo86]

/ok-to-test

[camilamacedo86]

/lgtm

[k8s-ci-robot]

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This pull-request has been approved by: antonincms, camilamacedo86

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