dont write workload identity to yaml file on deployment inspect

[melugoyal]

Description

Describe the purpose of this pull request.

don't write workload identity to yaml file on deployment inspect. this was breaking the flow of:

1. astro deployment inspect on an existing deployment
2. modify file with new deployment config
3. create deployment

the breakage was happening because the new deployment's create payload would contain the Workload Identity from the previous deployment. instead we can leave the value empty upon astro deployment inspect, and the API will default it. if someone has an override to pass in, they can enter it in the deployments-as-code file.

🎟 Issue(s)

Related #XXX

🧪 Functional Testing

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

📸 Screenshots

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📋 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

All modified and coverable lines are covered by tests ✅

Project coverage is 86.41%. Comparing base (57f4ae5) to head (1c3c443).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1565      +/-   ##
==========================================
- Coverage   86.41%   86.41%   -0.01%     
==========================================
  Files         113      113              
  Lines       15670    15668       -2     
==========================================
- Hits        13542    13540       -2     
  Misses       1280     1280              
  Partials      848      848              

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