Rename workflows to match workflow names (#5866)

## Summary
- rename each GitHub Actions workflow file so its filename matches the
workflow `name` value for easier discovery

------
https://chatgpt.com/codex/tasks/task_e_68dc213f0a808330869ed73c27858eb9

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5866-Rename-workflows-to-match-workflow-names-27e6d73d36508103bca7ea2746f73a3b)
by [Unito](https://www.unito.io)

.github/workflows/devtools-python-check.yaml

@@ -0,0 +1,26 @@
+name: Devtools Python Check
+
+on:
+  pull_request:
+    paths:
+      - 'tools/devtools/**'
+  push:
+    branches: [ main ]
+    paths:
+      - 'tools/devtools/**'
+
+jobs:
+  syntax:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Validate Python syntax
+        run: python3 -m compileall -q tools/devtools