Interpreter dropdown overhaul

[dhruvisompura]

The Interpreter dropdown is being simplified as a component to provide a better UX to users as part of the work for multiple sessions.

The dropdown is being replaced with a button that only has two jobs:

• show the name of the active session/env
• allow the user to switch between active sessions

The mechanisms for managing a session (start/stop/restart) are moving into the console pane.

When the button is clicked, a user should see a quick pick list to select an active interpreter session. When clicked, the command palette should be rendered with the list of active session from runtimeSessionService.activeSessions

Testing

• Verify the active session changes for editor, and variables pane when changed from the interpreter dropdown
• Verify the interpreter dropdown label shows the new active session name when switching sessions via console tab

[juliasilge]

Problems with the existing UI reported in #6222

[midleman]

Verified Fixed

Positron Version(s) : 2025.03.0-83
OS Version(s) : MacOS

Test scenario(s)

Confirmed that the new session picker works as expected and displays accurate active sessions. Closing out as complete.

The following tests have been added:

• e2e test to ensure that we are able to interact with the session picker button.
• e2e test to ensure active session list between console and session picker match