Add default priority_weight for DbtProducerWatcherOperator

[pankajkoti]

Add a high-value priority_weight (9999) to the DbtProducerWatcherOperator
so that we guarantee this task runs before any sensor tasks in the DAG that
would have the default priority_weight=1

Refer: https://airflow.apache.org/docs/apache-airflow/stable/administration-and-deployment/priority-weight.html

closes: #1959
closes: https://github.com/astronomer/oss-integrations-private/issues/237

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[Copilot]

Pull Request Overview

Adds a high priority weight default (9999) to the DbtProducerWatcherOperator to ensure it runs before other tasks with default priority weights in Airflow DAGs.

• Set default priority_weight to 9999 in the operator's __init__ method
• Allow users to override the default priority weight if needed
• Added comprehensive test coverage for both default and override scenarios

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cosmos/operators/watcher.py	Added default priority_weight=9999 to DbtProducerWatcherOperator constructor
tests/operators/test_watcher.py	Added tests to verify default priority weight and override functionality

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[tatiana]

A minor suggestion - but looks good, thanks, @pankajkoti !

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.77%. Comparing base (ab88c29) to head (920124d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1995   +/-   ##
=======================================
  Coverage   97.77%   97.77%           
=======================================
  Files          87       87           
  Lines        5447     5449    +2     
=======================================
+ Hits         5326     5328    +2     
  Misses        121      121           

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