docs: bifurcate documentation into user and admin sections (#38196)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

docs/developer_docs/testing/backend-testing.md

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+---
+title: Backend Testing
+sidebar_position: 3
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
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+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
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+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# Backend Testing
+
+🚧 **Coming Soon** 🚧
+
+Complete guide for testing Superset's Python backend, APIs, and database interactions.
+
+## Topics to be covered:
+
+- Pytest configuration and fixtures
+- Unit testing best practices
+- Integration testing with databases
+- API endpoint testing
+- Mocking strategies and patterns
+- Testing async operations with Celery
+- Security testing guidelines
+- Performance and load testing
+- Test database setup and teardown
+- Coverage requirements
+
+## Quick Commands
+
+```bash
+# Run all backend tests
+pytest
+
+# Run specific test file
+pytest tests/unit_tests/specific_test.py
+
+# Run with coverage
+pytest --cov=superset
+
+# Run tests in parallel
+pytest -n auto
+
+# Run only unit tests
+pytest tests/unit_tests/
+
+# Run only integration tests
+pytest tests/integration_tests/
+```
+
+---
+
+*This documentation is under active development. Check back soon for updates!*