Fix repairing tasks declared in inner task groups

[tatiana]

Fix two problems with the repair feature, related to the following buttons:

• Repair All Failed Tasks did not repair tasks inside an inner TaskGroup
• Repair a single failed task was disabled if tasks were inside an inner TaskGroup

A customer reported these problems, and this behaviour happened with all Airflow versions (from 2.2.4 until 2.6)

This change was validated through unit tests and also manually, using Ubuntu 22.x, by following these steps:

• Running Airflow 2.6, as described in our docs. The only difference was that the astro-provider-databricks was installed using pip install -e .[tests] from the branch repair-inner-task-group.
• Triggering the dag example_task_group manually
• Going to the Databricks UI and cancelling the task related to the nb3
• Trying out the buttons "Repair All Failed Tasks" and "Repair a single failed task"

The fix for the second issue can be visually seen in this screenshot:

DIsclaimer: This change was also tested on Airflow 2.2.4, and observed that when the feature repair is used in this version, the Airflow tasks are not cleared - but the Databricks job is repaired.

[codecov-commenter]

Codecov Report

Patch coverage: 70.00% and project coverage change: -0.43 :warning:

Comparison is base (d6c9c22) 78.33% compared to head (8e22e6b) 77.91%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #49 +/- ## ========================================== - Coverage 78.33% 77.91% -0.43% ========================================== Files 5 5 Lines 480 498 +18 Branches 64 66 +2 ========================================== + Hits 376 388 +12 - Misses 83 88 +5 - Partials 21 22 +1 ``` | [Impacted Files](https://app.codecov.io/gh/astronomer/astro-provider-databricks/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=astronomer) | Coverage Δ | | |---|---|---| | [src/astro\_databricks/plugins/plugin.py](https://app.codecov.io/gh/astronomer/astro-provider-databricks/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=astronomer#diff-c3JjL2FzdHJvX2RhdGFicmlja3MvcGx1Z2lucy9wbHVnaW4ucHk=) | `68.46% <70.00%> (-0.16%)` | :arrow_down: |

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