fix error-code

[sunkickr]

Description

upgrade-test command doesn't return an exit code of 1 when the DAG parse test fails. This makes it so the failures doesn't stop their CI/CD pipeline

🎟 Issue(s)

• https://github.com/astronomer/astro-cli/issues/1647

  🧪 Functional Testing

manual testing

📸 Screenshots

Add screenshots to illustrate the validity of these changes.

📋 Checklist

• [ ] Rebased from the main (or release if patching) branch (before testing)
• [ ] Ran make test before taking out of draft
• [ ] Ran make lint before taking out of draft
• [ ] Added/updated applicable tests
• [ ] Tested against Astro-API (if necessary).
• [ ] Tested against Houston-API and Astronomer (if necessary).
• [ ] Communicated to/tagged owners of respective clients potentially impacted by these changes.
• [ ] Updated any related documentation

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 86.77%. Comparing base (5e0cdac) to head (98890f9).

Files	Patch %	Lines
airflow/docker.go	66.66%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1646 +/- ## ======================================= Coverage 86.76% 86.77% ======================================= Files 114 114 Lines 16693 16697 +4 ======================================= + Hits 14483 14488 +5 Misses 1323 1323 + Partials 887 886 -1 ```

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