chore: Enhance documentation for E2E testing:

- Added clarity and structure to README files, including recent updates and getting started sections.
- Improved manual verification documentation for CrowdSec authentication, emphasizing expected outputs and success criteria.
- Updated debugging guide with detailed output examples and automatic trace capture information.
- Refined best practices for E2E tests, focusing on efficient polling, locator strategies, and state management.
- Documented triage report for DNS Provider feature tests, highlighting issues fixed and test results before and after improvements.
- Revised E2E test writing guide to include when to use specific helper functions and patterns for better test reliability.
- Enhanced troubleshooting documentation with clear resolutions for common issues, including timeout and token configuration problems.
- Updated tests README to provide quick links and best practices for writing robust tests.

docs/testing/sprint1-improvements.md

@@ -11,11 +11,13 @@ During Sprint 1, we resolved critical issues affecting E2E test reliability and
 **What was happening**: Some tests would hang indefinitely or timeout after 30 seconds, especially in CI/CD pipelines.
 
 **Root cause**:
+
 - Config reload overlay was blocking test interactions
 - Feature flag propagation was too slow during high load
 - API polling happened unnecessarily for every test
 
 **What we did**:
+
 1. Added smart detection to wait for config reloads to complete
 2. Increased timeouts to accommodate slower environments
 3. Implemented request caching to reduce redundant API calls