Add workload identity to hosted deployment

[neel-astro]

Description

Changes:

• Add workload identity flag for astro deployment create and astro deployment update commands for dedicated and standard deployments
• Add workload identity field in the file-based deployment operation, i.e. astro deployment --deployment-file for dedicated and standard deployments
• Fix update deployment unit tests to make it stateless, until now a lot of state is shared/global, which makes adding any new unit test extremely tedious.

🎟 Issue(s)

Related #1704

🧪 Functional Testing

• astro deployment create case with workload identity flag

• astro deployment update case with workload identity flag

• astro deployment case for deployments running on azure/gcp

• astro deployment create case using a deployment yaml file

• astro deployment update case using a deployment yaml file

📸 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

[neel-astro]

dropped the global variable, this makes no difference from CLI functionality pov, but it messes up the unit tests, since the global variables are shared

[neel-astro]

This fixes the state leak issue between unit tests from #1698, I had to do this bit here because otherwise, the existing unit tests were making it almost impossible to write new unit tests, and it took me 3 hours to write a single update deployment test scenario in this file 🤷

[kushalmalani]

LGTM!