dra api: enable new CEL features by faking their version

There are two approaches for making new versioned CEL features available in the
release where they get introduced:
- Always use the environment for "StoredExpressions".
- Use an older version (typically 1.0) and only bump it up later.

The second approach was used before, so this is now also done here.

pkg/apis/resource/structured/namedresources/validation/validation.go

@@ -149,16 +149,10 @@ func validateSelector(opts Options, selector string, fldPath *field.Path) field.
 	if selector == "" {
 		allErrs = append(allErrs, field.Required(fldPath, ""))
 	} else {
-		// TODO (https://github.com/kubernetes/kubernetes/issues/123687):
-		// when this API gets promoted to beta, we have to
-		// validate new and stored expressions differently.
-		// While it is alpha, new expressions are allowed to
-		// use everything that is currently available.
-		// envType := environment.NewExpressions
-		// if opts.StoredExpressions {
-		//    envType = environment.StoredExpressions
-		// }
-		envType := environment.StoredExpressions
+		envType := environment.NewExpressions
+		if opts.StoredExpressions {
+			envType = environment.StoredExpressions
+		}
 		result := namedresourcescel.Compiler.CompileCELExpression(selector, envType)
 		if result.Error != nil {
 			allErrs = append(allErrs, convertCELErrorToValidationError(fldPath, selector, result.Error))

staging/src/k8s.io/dynamic-resource-allocation/structured/namedresources/cel/compile.go

@@ -187,7 +187,12 @@ func mustBuildEnv() *environment.EnvSet {
 	envset := environment.MustBaseEnvSet(environment.DefaultCompatibilityVersion())
 	versioned := []environment.VersionedOptions{
 		{
-			IntroducedVersion: version.MajorMinor(1, 30),
+			// Feature epoch was actually 1.30, but we artificially set it to 1.0 because these
+			// options should always be present.
+			//
+			// TODO (https://github.com/kubernetes/kubernetes/issues/123687): set this
+			// version properly before going to beta.
+			IntroducedVersion: version.MajorMinor(1, 0),
 			EnvOptions: append(buildVersionedAttributes(),
 				SemverLib(),
 			),