feat(ng-dev): allow target: automation to target next branch (#3057)

Pull requests with the `target: automation` label are now able to target the `next` branch. This is useful for automating changes that should land in the next major version.

PR Close #3057

Author: alan-agius4

.github/local-actions/branch-manager/main.js

@@ -156,9 +156,9 @@ export async function getTargetLabelConfigsForActiveReleaseTrains(
     {
       label: targetLabels['TARGET_AUTOMATION'],
       branches: (githubTargetBranch) => {
-        if (!isVersionBranch(githubTargetBranch)) {
+        if (githubTargetBranch !== nextBranchName && !isVersionBranch(githubTargetBranch)) {
           throw new InvalidTargetBranchError(
-            '"target: automation" pull requests can only target a release branch',
+            '"target: automation" pull requests can only target a releasable branch',
           );
         }
         return [githubTargetBranch];