debugger: Filter out debug scenarios with invalid Adapters from debug picker (#35744)

I also removed a debug assertion that wasn't true when a debug session
was restarting through a request, because there wasn't a booting task
Zed needed to run before the session.

I renamed SessionState::Building to SessionState::Booting as well,
because building implies that we're building code while booting the
session covers more cases and is more accurate.

Release Notes:

- debugger: Filter out more invalid debug configurations from the debug
picker

Co-authored-by: Remco Smits <djsmits12@gmail.com>

crates/debugger_ui/src/debugger_panel.rs

@@ -300,7 +300,7 @@ impl DebugPanel {
         });
 
         session.update(cx, |session, _| match &mut session.mode {
-            SessionState::Building(state_task) => {
+            SessionState::Booting(state_task) => {
                 *state_task = Some(boot_task);
             }
             SessionState::Running(_) => {