CLOUDP-274986: Add validation

Author: lovisaberggren

tools/spectral/.spectral.yaml

@@ -186,6 +186,20 @@ rules:
       functionOptions:
         notMatch: "/[^/]+/:[a-zA-Z]+$"
 
+  xgen-security-override:
+    description: "Security must not be set at resource or method level because it is set globally. Use @Unauthenticated annotation to set no security. https://go/openapi-unauthenticated-annotation"
+    severity: error
+    given: "#OperationObject.security"
+    then:
+      function: schema
+      functionOptions:
+        schema:
+          type: array
+          items:
+            type: object
+          minItems: 0
+          maxItems: 0
+
 overrides:
   - files: # load sample data has an issue with different path param names for different VERBS
       - "*.yaml#/paths/~1api~1atlas~1v1.0~1groups~1%7BgroupId%7D~1sampleDatasetLoad~1%7BsampleDatasetId%7D"