Revert "chore(ci): Enforce test label with CI check"

This reverts commit 5da7f07fbe.

The status check patterns are not updated correctly, so this change adds
mainly confusion and little value.

See https://codeberg.org/forgejo/forgejo/pulls/5769

.forgejo/workflows/merge-requirements.yml

@@ -1,44 +0,0 @@
-# Copyright 2024 The Forgejo Authors
-# SPDX-License-Identifier: MIT
-
-name: requirements
-
-on:
-  pull_request:
-    types:
-      - labeled
-      - edited
-      - opened
-      - synchronize
-
-jobs:
-  testing:
-    runs-on: docker
-    container:
-      image: 'code.forgejo.org/oci/node:20-bookworm'
-    steps:
-      - name: Debug output
-        run: |
-          cat <<'EOF'
-          ${{ toJSON(github.event.pull_request) }}
-          EOF
-      - name: Missing test label
-        if: >
-          !(
-            contains(toJSON(github.event.pull_request.labels), 'test/present')
-            || contains(toJSON(github.event.pull_request.labels), 'test/not-needed')
-            || contains(toJSON(github.event.pull_request.labels), 'test/manual')
-          )
-        run: |
-          echo "Test label must be set to either 'present', 'not-needed' or 'manual'."
-          exit 1
-      - name: Missing manual test instructions
-        if: >
-          (
-            contains(toJSON(github.event.pull_request.labels), 'test/manual')
-            && !contains(toJSON(github.event.pull_request.body), '# Test')
-          )
-        run: |
-          echo "Manual test label is set. The PR description needs to contain test steps introduced by a heading like:"
-          echo "# Testing"
-          exit 1