dbt: Fix --target-path CLI flag being ignored (#4141)

[gaurav-atlan]

The --target-path CLI flag was not being parsed from command line arguments and passed to the DbtStructuredLogsProcessor and DbtLocalArtifactProcessor constructors. This caused the processors to always use the default target path instead of the user-specified one.

One-line summary for changelog:

Fix --target-path CLI flag being ignored in dbt-ol command (#4141)

Meaningful description

Problem: When running dbt-ol run --target-path /custom/path, the --target-path CLI flag was being ignored. The tool would always look for artifacts (run_results.json, manifest.json, etc.) in the default target/ directory instead of the user-specified path.

Root cause: The main() function in integration/dbt/src/openlineage/dbt/__init__.py was not parsing the --target-path argument from the command line. Although DbtLocalArtifactProcessor already accepts a target_path parameter and has proper precedence logic in build_target_path(), the value was never being extracted from CLI arguments and passed to the processor constructors.

Solution: Parse --target-path from CLI arguments in main() and pass it through to both consume_structured_logs() and consume_local_artifacts() functions, which then forward it to their respective processor constructors (DbtStructuredLogsProcessor and DbtLocalArtifactProcessor).

Alternatives considered: None - this was a straightforward bug fix where the existing infrastructure to handle target_path was already in place but simply not being utilized.

[boring-cyborg]

Thanks for opening your first OpenLineage pull request! We appreciate your contribution. If you haven't already, please make sure you've reviewed our guide for new contributors (https://github.com/OpenLineage/OpenLineage/blob/main/CONTRIBUTING.md).

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.68%. Comparing base (ea3bc55) to head (fba2ceb).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4298   +/-   ##
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  Coverage   71.68%   71.68%           
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  Files          21       21           
  Lines        2179     2179           
=======================================
  Hits         1562     1562           
  Misses        617      617           

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[boring-cyborg]

Great job! Congrats on your first merged pull request in OpenLineage!