Copy DAGs folder before running pytest command

[neel-astro]

Description

Changes:

• Fix potentially missing DAGs folder when pytest is run during astro deploy with dags only deploy. This change would explicitly copy the DAGs folder before running the pytest container.

🎟 Issue(s)

Original change: #1351
Slack thread conversation: https://astronomer.slack.com/archives/CL44PA4DB/p1692987720142969

🧪 Functional Testing

List the functional testing steps to confirm this feature or fix.

📸 Screenshots

All tests passing, on a Linux CI machine

Copied advanced DAG file to dags/test-dags, so that pytest would fail because of duplicate DAGs, and it would also show that the DAGs folder is being picked up for pytest when running dags deploy

📋 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]

Codecov Report

❗ No coverage uploaded for pull request base (main@f142e1d). Click here to learn what that means.
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1368   +/-   ##
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  Coverage        ?   86.85%           
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  Files           ?      114           
  Lines           ?    13922           
  Branches        ?        0           
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  Hits            ?    12092           
  Misses          ?     1092           
  Partials        ?      738           

Files Changed	Coverage Δ
airflow/docker_image.go	82.89% <100.00%> (ø)

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