Force watcher producer retries to zero

[pankajkoti]

The PR makes the following changes:

• hard-set DbtProducerWatcherOperator retries (and default_args["retries"]) to zero so WATCHER never auto-retries the full dbt build
• Log at INFO that producer retries are disabled, and fail fast if Airflow attempts a retry (try number > 1), improving user visibility into the behavior.
• explain the rationale inline (sensor retry path handles per-model reruns)
• document behavior in the WATCHER guide and add tests covering the forced retry value

closes: #2105

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[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.80%. Comparing base (1f11793) to head (0bee20a).

Files with missing lines	Patch %	Lines
cosmos/operators/watcher.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2114      +/-   ##
==========================================
- Coverage   97.81%   97.80%   -0.02%     
==========================================
  Files          92       92              
  Lines        5948     5961      +13     
==========================================
+ Hits         5818     5830      +12     
- Misses        130      131       +1     

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[Copilot]

Pull Request Overview

This PR ensures that DbtProducerWatcherOperator never auto-retries by forcing its retries parameter to zero. The rationale is that consumer watcher sensors handle model-level retries individually using LOCAL execution mode, and re-running the producer would duplicate the full dbt build and create duplicate watcher callbacks that consumers may not process correctly if they've already handled XCOMs from the first run.

• Forces retries to 0 in the operator's __init__ method, overriding any user-provided values
• Documents the behavior in the WATCHER execution mode guide
• Adds test coverage for the forced retry behavior

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
cosmos/operators/watcher.py	Adds logic to force retries and default_args["retries"] to 0 with inline explanation
docs/getting_started/watcher-execution-mode.rst	Documents why producer retries are disabled and explains the consumer-level retry strategy
tests/operators/test_watcher.py	Adds two tests verifying that retries are forced to 0 regardless of user input

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[tatiana]

Great work, @pankajkoti , thank you!