[ VM / DDS ] Add --print-dtd-uri flag and launch DTD from the correct snapshot for AOT

This adds support for printing the DTD connection information to stdout
when --print-dtd-uri is passed.

This change also fixes an issue where DDS would fail to spawn an isolate
with the DTD snapshot when DDS was running in AOT mode. This means the
SDK must be shipped with both AppJIT and AOT DTD snapshots, at least
until dartdev is moved to run from AOT.

Fixes https://github.com/dart-lang/sdk/issues/55034

TEST=run_test.dart

Change-Id: I788ef9bfe76297a8d594992a2aac440ed9e2ecac
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/358541
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>
Reviewed-by: Kenzie Davisson <kenzieschmoll@google.com>

utils/dartdev/BUILD.gn

@@ -28,11 +28,6 @@ application_snapshot("generate_dartdev_snapshot") {
     "../dtd:dtd",
   ]
 
-  # DDS should be run from AOT snapshot on all architectures except IA32/X86.
-  if (dart_target_arch != "ia32" && dart_target_arch != "x86") {
-    deps += [ "../dds:dds_aot" ]
-  }
-
   vm_args = [ "--sound-null-safety" ]
   output = "$root_gen_dir/dartdev.dart.snapshot"
 }