default deployment creation when no deployments exists in workspace

[kushalmalani]

Description

Describe the purpose of this pull request.

default deployment creation when no deployments exists in workspace

🎟 Issue(s)

Related #1356

🧪 Functional Testing

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

📸 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[bot]]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 86.55%. Comparing base (c00de46) to head (8356695).

Files	Patch %	Lines
cloud/deployment/deployment.go	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1587 +/- ## ========================================== - Coverage 86.55% 86.55% -0.01% ========================================== Files 114 114 Lines 15932 15935 +3 ========================================== + Hits 13790 13792 +2 - Misses 1287 1288 +1 Partials 855 855 ```

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