feat(remove): remove deprecated providerRef

Signed-off-by: Christopher Haar <christopher.haar@upbound.io>

pkg/resource/fake/mocks.go

@@ -64,7 +64,7 @@ func (m *ManagedResourceReferencer) SetResourceReference(r *corev1.ObjectReferen
 func (m *ManagedResourceReferencer) GetResourceReference() *corev1.ObjectReference { return m.Ref }
 
 // ProviderConfigReferencer is a mock that implements ProviderConfigReferencer interface.
-type ProviderConfigReferencer struct{ Ref *xpv1.Reference }
+type ProviderConfigReferencer struct{ Ref *xpv1.Reference } //nolint:musttag // This is a fake implementation to be used in unit tests only.
 
 // SetProviderConfigReference sets the ProviderConfigReference.
 func (m *ProviderConfigReferencer) SetProviderConfigReference(p *xpv1.Reference) { m.Ref = p }