Switch description from query parameter to form data sending deploy description to dag server

[Simpcyclassy]

Description

This PR modifies the way the description is handled in the UploadFile function. Previously, the description was passed as a query parameter in the URL. It is now switched to be sent as form data along with the file in the multipart request.

Key changes:

• Switched description from a query parameter to form data.
• Added the description field to the UploadFileArguments struct.
• Updated the UploadFile function to handle the description as form data.

This change improves the handling of spaces and special characters in the description, avoiding issues caused by URL encoding.

Related astronomer/issues/issues/6663

🧪 Functional Testing

• Adjusted all related test cases in TestUploadFile to reflect this change.

📸 Screenshots

Add screenshots to illustrate the validity of these changes.

📋 Checklist

• [ ] 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
• [ ] Added/updated applicable tests
• [ ] Tested against Astro-API (if necessary).
• [x] Tested against Houston-API and Astronomer (if necessary).
• [ ] Communicated to/tagged owners of respective clients potentially impacted by these changes.
• [ ] Updated any related documentation

[Simpcyclassy]

I do not have the permission to merge. I need help merging this @neel-astro