ci: rename branch-protection caller job id check -> branch-protection

GitHub names a reusable-workflow status context `<caller-job-id> / <called-job-name>`, so this
caller reported as `check / check-branch` while the org ruleset requires
`branch-protection / check-branch`. The required context never reported at all, leaving PRs to
main/beta permanently BLOCKED.

Author: rubenvdlinde

.github/workflows/branch-protection.yml

@@ -5,6 +5,11 @@ on:
     branches: [main, beta]
 
 jobs:
-  check:
+  # Job id must stay `branch-protection` so the check reports as
+  # `branch-protection / check-branch`, which is the context name the org
+  # ruleset requires. GitHub names a reusable-workflow context
+  # `<caller-job-id> / <called-job-name>`, so renaming this job silently
+  # detaches the required status check and leaves PRs permanently pending.
+  branch-protection:
     uses: ConductionNL/.github/.github/workflows/branch-protection.yml@main
     secrets: inherit