Publish a SWA from VS Code

Needs discussion

1. Select a SWA (exclude ones that are connected to GitHub):
   • Create a SWA without connecting to GitHub
   • Or select from list of SWAs not connected to GitHub
2. Select a storage account and blob container (must be private) - Currently, the deployment API takes a URL to a zip file so a Storage account is needed. Need to figure out the most seamless experience here to ensure one exists and to select it.
3. Select frontend app output/artifacts location
4. Select backend app location (do we build the app for them? what if it's an app like C# that builds into a subdirectory?)

Then the extension will zip up the 2 folders in the right format and upload it to the container. Generate a SAS URI for the file and call the zipdeploy API with the SAS URI.

When successful, do we delete the file from storage?

/cc @miwebst @annaji-msft

The issue names no files, tests, or entry points. Start by mapping the extension's existing SWA publishing flow, then resolve the open decisions around resource selection, build locations, storage handling, SAS upload, and cleanup before implementation. Done means the complete VS Code workflow is defined and successfully publishes both frontend and backend artifacts.