Add copilot-requests permission, gated by feature flag (#335)

* Add copilot-requests permission gated by feature flag

This add a new 'copilot-requests' permission to the workflow schema,
gated behind the 'allowCopilotRequestsPermission' experimental
feature flag.

When the flag is disabled (default), `copilot-requests` is filtered
out of autocomplete suggestions. When enabled, it appears
alongside other permissions like actions, contents, pull-requests,
etc.

* Update workflow-parser/src/workflow-v1.0.json

* Add additional unit test coverage

* Fix formatting

expressions/src/features.test.ts

@@ -55,7 +55,8 @@ describe("FeatureFlags", () => {
         "missingInputsQuickfix",
         "blockScalarChompingWarning",
         "allowCaseFunction",
-        "allowCronTimezone"
+        "allowCronTimezone",
+        "allowCopilotRequestsPermission"
       ]);
     });
   });

expressions/src/features.ts

@@ -40,6 +40,12 @@ export interface ExperimentalFeatures {
    * @default false
    */
   allowCronTimezone?: boolean;
+
+  /**
+   * Enable the copilot-requests permission in workflow permissions.
+   * @default false
+   */
+  allowCopilotRequestsPermission?: boolean;
 }
 
 /**
@@ -55,7 +61,8 @@ const allFeatureKeys: ExperimentalFeatureKey[] = [
   "missingInputsQuickfix",
   "blockScalarChompingWarning",
   "allowCaseFunction",
-  "allowCronTimezone"
+  "allowCronTimezone",
+  "allowCopilotRequestsPermission"
 ];
 
 export class FeatureFlags {