fix(dashboard): handle update-not-scheduled PRs (#10337)

Closes #9275

lib/workers/branch/__snapshots__/index.spec.ts.snap

@@ -220,7 +220,7 @@ exports[`workers/branch/index processBranch skips branch if not scheduled and no
 Object {
   "branchExists": true,
   "prNo": undefined,
-  "result": "not-scheduled",
+  "result": "update-not-scheduled",
 }
 `;
 

lib/workers/branch/index.ts

@@ -241,7 +241,7 @@ export async function processBranch(
         return {
           branchExists,
           prNo: branchPr?.number,
-          result: BranchResult.NotScheduled,
+          result: BranchResult.UpdateNotScheduled,
         };
       }
       // istanbul ignore if

lib/workers/types.ts

@@ -89,6 +89,7 @@ export enum BranchResult {
   CommitLimitReached = 'commit-limit-reached',
   BranchLimitReached = 'branch-limit-reached',
   Rebase = 'rebase',
+  UpdateNotScheduled = 'update-not-scheduled',
 }
 
 export interface BranchConfig