TI.log_url fix for map_index

[fritz-astronomer]

closes: #24328
related: #24328

Adds map_index to the task_instance.log_url link, which fixes a bug previously that prevented logs being displayed correctly at the link given.

[fritz-astronomer]

Note - my local breeze tests may not have been working correctly. I had failures but mostly with tests/providers

[fritz-astronomer]

This could definitely use some more unhappy-path tests. That required a slight overhaul to some of the pytest fixtures, so I didn't undertake it yet

[github-actions]

The PR most likely needs to run full matrix of tests because it modifies parts of the core of Airflow. However, committers might decide to merge it quickly and take the risk. If they don't merge it quickly - please rebase it to the latest main at your convenience, or amend the last commit of the PR, and push it with --force-with-lease.

[fritz-astronomer]

build failure appears to be unrelated to my code, release_notes.md misspelling - I cannot merge, so if anyone else wants to click the button (or let me know if I need to find time to make those unhappy path tests 😅 )

[potiuk]

Merged @fritz-astronomer :) - it was indeed intermittent failure.