Bug: Split Button not Rendering for smaller screens

[nickytonline]

Describe the bug

We shipped the split button to replace the Add to Workspace and Create Workspace from SBOM buttons on a repository page, but missed adding it for smaller screens.

Steps to reproduce

1. Go to any repository page and shrink the page width until it hits the smallest breakpoint.

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[zeucapua]

I believe this is due to the mobile view using AddToWorkspaceDrawer has it's own trigger prop that requires a button and there are no other way to trigger it. Let me look into the drawer library and see if there's a workaround to opening the drawer from somewhere other than the trigger. Initial thoughts: maybe use a ref to the button?