Re-introduce `make generate` into CI

[julianKatz]

When updating conversion-gen to v0.20.2 in open-policy-agent/frameworks#111, I found a bug. Certain conversion functions were not being included in the generated output.

This bug is being tracked (kubernetes/kubernetes#101567) and is already triaged and assigned.

To get around this bug, I manually changed the conversion file. This will meet our needs in the short term, but is not sustainable. Once the fix is available to us, we should upgrade our conversion-gen and get our automation working correctly again.

[julianKatz]

Here is the diff that I made by manually updating the generated conversion files:

diff --git a/constraint/pkg/apis/templates/v1alpha1/zz_generated.conversion.go b/constraint/pkg/apis/templates/v1alpha1/zz_generated.conversion.go
index 7a2a718..b24233e 100644
--- a/constraint/pkg/apis/templates/v1alpha1/zz_generated.conversion.go
+++ b/constraint/pkg/apis/templates/v1alpha1/zz_generated.conversion.go
@@ -434,9 +434,8 @@ func autoConvert_v1alpha1_Validation_To_templates_Validation(in *Validation, out
 	if in.OpenAPIV3Schema != nil {
 		in, out := &in.OpenAPIV3Schema, &out.OpenAPIV3Schema
 		*out = new(apiextensions.JSONSchemaProps)
-		// FIXME: Provide conversion function to convert v1beta1.JSONSchemaProps to apiextensions.JSONSchemaProps
-		compileErrorOnMissingConversion()
+		if err := v1beta1.Convert_v1beta1_JSONSchemaProps_To_apiextensions_JSONSchemaProps(*in, *out, s); err != nil {
+			return err
+		}
 	} else {
 		out.OpenAPIV3Schema = nil
 	}
diff --git a/constraint/pkg/apis/templates/v1beta1/zz_generated.conversion.go b/constraint/pkg/apis/templates/v1beta1/zz_generated.conversion.go
index 72aaeb5..1df4c21 100644
--- a/constraint/pkg/apis/templates/v1beta1/zz_generated.conversion.go
+++ b/constraint/pkg/apis/templates/v1beta1/zz_generated.conversion.go
@@ -434,9 +434,8 @@ func autoConvert_v1beta1_Validation_To_templates_Validation(in *Validation, out
 	if in.OpenAPIV3Schema != nil {
 		in, out := &in.OpenAPIV3Schema, &out.OpenAPIV3Schema
 		*out = new(apiextensions.JSONSchemaProps)
-		// FIXME: Provide conversion function to convert apiextensionsv1beta1.JSONSchemaProps to apiextensions.JSONSchemaProps
-		compileErrorOnMissingConversion()
+		if err := apiextensionsv1beta1.Convert_v1beta1_JSONSchemaProps_To_apiextensions_JSONSchemaProps(*in, *out, s); err != nil {
+			return err
+		}
 	} else {
 		out.OpenAPIV3Schema = nil
 	}

[willbeason]

https://github.com/kubernetes/kubernetes/issues/101567 has been unassigned; it looks like progress isn't currently being made for it.