Adding e2e scenario tests for maintenance push notifications handling.

[petyaslavova]

Pull Request check-list

Please make sure to review and check all of these items:

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

Please provide a description of the change here.

[Copilot]

Pull Request Overview

This pull request adds end-to-end scenario tests for Redis Enterprise maintenance push notifications handling, specifically for hitless upgrade scenarios involving cluster operations.

• Implements comprehensive scenario tests for migration and bind operations with push notifications
• Adds helper classes for cluster operations and client validations
• Updates configuration to support the new testing framework

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/test_scenario/test_hitless_upgrade.py	Main test file implementing e2e tests for maintenance push notifications during cluster operations
tests/test_scenario/hitless_upgrade_helpers.py	Helper classes for cluster operations and client validations
tests/test_scenario/conftest.py	Test configuration and fixtures for Redis client setup
redis/maintenance_events.py	Updates default relax_timeout value from 20 to 10 seconds
redis/connection.py	Refactors connection parameter handling for maintenance events

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Comment should use proper capitalization: "If orig_host_address is None it means we haven't configured the original values yet"

Suggested change

	# if orig_host_address is None it means we haven't
	# configured the original values yet
	# If orig_host_address is None, it means we haven't configured the original values yet

[petyaslavova]

Closing this PR. New one is posted that has been started from master and is without conflicts --> #3758