Make branch protection attempt less restrictive

In case if something wrong happens along the way when trying to apply protection of a newly created branch - log error, instead of throwing an it, making scaffolder exit with non-zero exit code.
This one addresses the issue #6330

Signed-off-by: Eugene S <jh.sh@me.com>

.changeset/wet-queens-deny.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+removing mandatory of protection for the default branch, that could be handled by the GitHub automation in async manner, thus throwing floating errors

plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/github.ts

@@ -268,8 +268,8 @@ export function createPublishGithubAction(options: {
           defaultBranch,
         });
       } catch (e) {
-        throw new Error(
-          `Failed to add branch protection to '${newRepo.name}', ${e}`,
+        ctx.logger.warn(
+          `Skipping: default branch protection on '${newRepo.name}', ${e.message}`,
         );
       }