debugger: More tidy up for SSH (#28993)

Split `locator` out of DebugTaskDefinition to make it clearer when
location needs to happen.

Release Notes:

- N/A

---------

Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Anthony <anthony@zed.dev>
Co-authored-by: Cole Miller <m@cole-miller.net>

crates/remote_server/Cargo.toml

@@ -29,7 +29,7 @@ backtrace = "0.3"
 chrono.workspace = true
 clap.workspace = true
 client.workspace = true
-dap.workspace = true
+dap_adapters.workspace = true
 env_logger.workspace = true
 extension.workspace = true
 extension_host.workspace = true