Simplify debug launcher UI (#31928)

This PR updates the name of the `NewSessionModal` to `NewProcessModal`
(to reflect it's new purpose), changes the tabs in the modal to read
`Run | Debug | Attach | Launch` and changes the associated types in code
to match the tabs. In addition, this PR adds a few labels to the text
fields in the `Launch` tab, and adds a link to open the associated
settings file. In both debug.json files, added links to the zed.dev
debugger docs.

Release Notes:

- Debugger Beta: Improve the new process modal

crates/settings/src/settings.rs

@@ -115,3 +115,7 @@ pub fn initial_tasks_content() -> Cow<'static, str> {
 pub fn initial_debug_tasks_content() -> Cow<'static, str> {
     asset_str::<SettingsAssets>("settings/initial_debug_tasks.json")
 }
+
+pub fn initial_local_debug_tasks_content() -> Cow<'static, str> {
+    asset_str::<SettingsAssets>("settings/initial_local_debug_tasks.json")
+}