Support specifying workload identity at deployment create time

[jlaneve]

Description

This PR adds support for a new field, Workload Identity, on deployment create time. The corresponding API change has been merged and goes out next week.

There is a change in behavior for deployment yaml files / deployments as code:

• the deployment yaml file has two sections: config (can be edited) and metadata (can't be edited). so this PR moves workload ID from metadata to config
• if I have it set up today without the workload ID field in config section, it still works. so if a user wants to start using this workload ID with a pre-existing yaml file, they just need to move the field themselves

🎟 Issue(s)

n/a

🧪 Functional Testing

Built the CLI locally and ran against dev.

📸 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2fdacf7) 86.14% compared to head (d86a4f9) 86.16%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1550      +/-   ##
==========================================
+ Coverage   86.14%   86.16%   +0.01%     
==========================================
  Files         112      112              
  Lines       14945    14952       +7     
==========================================
+ Hits        12874    12883       +9     
+ Misses       1252     1251       -1     
+ Partials      819      818       -1     

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[vandyliu]

change is simple enough and unit test looks good
plus tested against dev env

[sunkickr]

should we add a --workload-identity flag to astro deployment create/update?

[sunkickr]

LGTM