debugger: Add console indicator and resolve debug configs from NewSessionModal (#28489)

The debug console will now show an indicator when it's unopened and
there's unread messages.

`NewSessionModal` attempts to resolve debug configurations before using
the config to start debugging. This allows users to use zed's task
variables in the modal prompt.

I had to invert tasks_ui dependency on debugger_ui so `NewSessionModal`
could get the correct `TaskContexts` by calling tasks_ui functions. A
consequence of this workspace has a new event `ShowAttachModal` that I'm
not a big fan of. @osiewicz if you have time could you please take a
look to see if there's a way around adding the event. I'm open to pair
on it too.

Release Notes:

- N/A

.zed/debug.json

@@ -1,13 +1,13 @@
 [
   {
-    "label": "Debug Zed with LLDB",
-    "adapter": "LLDB",
+    "label": "Debug Zed (CodeLLDB)",
+    "adapter": "CodeLLDB",
     "program": "$ZED_WORKTREE_ROOT/target/debug/zed",
     "request": "launch",
     "cwd": "$ZED_WORKTREE_ROOT"
   },
   {
-    "label": "Debug Zed with GDB",
+    "label": "Debug Zed (GDB)",
     "adapter": "GDB",
     "program": "$ZED_WORKTREE_ROOT/target/debug/zed",
     "request": "launch",