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>

Cargo.lock

@@ -4013,6 +4013,7 @@ dependencies = [
  "node_runtime",
  "parking_lot",
  "paths",
+ "proto",
  "schemars",
  "serde",
  "serde_json",
@@ -4897,7 +4898,6 @@ dependencies = [
  "client",
  "collections",
  "context_server",
- "dap",
  "dirs 5.0.1",
  "env_logger 0.11.8",
  "extension",
@@ -11743,6 +11743,7 @@ dependencies = [
  "client",
  "clock",
  "dap",
+ "dap_adapters",
  "env_logger 0.11.8",
  "extension",
  "extension_host",
@@ -14214,11 +14215,11 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "collections",
- "dap-types",
  "futures 0.3.31",
  "gpui",
  "hex",
  "parking_lot",
+ "proto",
  "schemars",
  "serde",
  "serde_json",