Reverted "Fixed #36620 -- Added coverage workflow to summarize coverage in pull requests."

This reverts commit a89183e638.

.github/workflows/coverage.yml

@@ -1,104 +0,0 @@
-name: Coverage
-
-on:
-  pull_request_target:
-    paths:
-      - 'django/**/*.py'
-      - 'tests/**/*.py'
-    branches:
-      - main
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-permissions:
-  contents: read
-  pull-requests: write
-
-jobs:
-  diff-coverage:
-    if: github.repository == 'django/django'
-    name: Diff Coverage (Windows)
-    runs-on: windows-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v5
-        with:
-          fetch-depth: 0
-          persist-credentials: false
-
-      - name: Set up Python
-        uses: actions/setup-python@v6
-        with:
-          python-version: '3.14'
-          cache: 'pip'
-          cache-dependency-path: 'tests/requirements/py3.txt'
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip wheel
-          python -m pip install -r tests/requirements/py3.txt -e .
-          python -m pip install 'coverage[toml]' diff-cover
-
-      - name: Run tests with coverage
-        env:
-          PYTHONPATH: ${{ github.workspace }}/tests
-          COVERAGE_PROCESS_START: ${{ github.workspace }}/tests/.coveragerc
-          RUNTESTS_DIR: ${{ github.workspace }}/tests
-        run: |
-          python -Wall tests/runtests.py -v2
-
-      - name: Generate coverage report
-        if: success()
-        env:
-          COVERAGE_RCFILE: ${{ github.workspace }}/tests/.coveragerc
-          RUNTESTS_DIR: ${{ github.workspace }}/tests
-        run: |
-          python -m coverage combine
-          python -m coverage report --show-missing
-          python -m coverage xml -o tests/coverage.xml
-
-      - name: Run diff-cover
-        if: success()
-        run: |
-          if (Test-Path 'tests/coverage.xml') {
-            diff-cover tests/coverage.xml --compare-branch=origin/main --fail-under=0 > tests/diff-cover-report.md
-          } else {
-            Set-Content -Path tests/diff-cover-report.md -Value 'No coverage.xml found; skipping diff-cover.'
-          }
-
-      - name: Post/update PR comment
-        if: success()
-        uses: actions/github-script@v8
-        with:
-          script: |
-            const fs = require('fs');
-            const reportPath = 'tests/diff-cover-report.md';
-            let body = 'No coverage data available.';
-            if (fs.existsSync(reportPath)) {
-              body = fs.readFileSync(reportPath, 'utf8');
-            }
-            const commentBody = '### 📊 Coverage Report for Changed Files\n\n```\n' + body + '\n```\n\n**Note:** Missing lines are warnings only. Some lines may not be covered by SQLite tests as they are database-specific.\n\nFor more information about code coverage on pull requests, see the [contributing documentation](https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#code-coverage-on-pull-requests).';
-
-            const { data: comments } = await github.rest.issues.listComments({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-            });
-            for (const c of comments) {
-              if ((c.body || '').includes('📊 Coverage Report for Changed Files')) {
-                await github.rest.issues.deleteComment({
-                  owner: context.repo.owner,
-                  repo: context.repo.repo,
-                  comment_id: c.id,
-                });
-              }
-            }
-
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-              body: commentBody,
-            });