Add support to fetch workload identity

[neel-astro]

Description

Changes:

• Adds --show-workload-identity boolean flag for astro deployment inspect command to fetch the workload identity value set for the deployment
• Returns the workload identity set for the deployment when running astro deployment create --deployment-file <deployment-file>. In this case, the field value would be populated without any new flag exposed for the astro deployment create command.

🎟 Issue(s)

Related #1571

🧪 Functional Testing

• Test the astro deployment inspect command (with and without the show-workload-identity flag) against a deployment using the default workload identity

  

• Test the astro deployment inspect command (with and without the show-workload-identity flag) against a deployment using custom workload identity

  

• Test the astro deployment create --deployment-file command with a deployment file containing custom workload identity.

  

• Test the astro deployment create --deployment-file command with a deployment file containing an empty string as workload identity.

  

📸 Screenshots

Add screenshots to illustrate the validity of these changes.

📋 Checklist

• [x] Rebased from the main (or release if patching) branch (before testing)
• [x] Ran make test before taking out of draft
• [x] Ran make lint before taking out of draft
• [x] Added/updated applicable tests
• [x] 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

[lzdanski]

• at least an additional improvement
• Updates to the CLI reference page (astro deployment inspect) with a link to https://www.astronomer.io/docs/astro/manage-deployments-as-code (need to confirm this is only for scenarios where users are using a deployment config file).