[infra] Add configurations for vm-linux-debug-arm64 and vm-aot-linux-debug-arm64.

Change-Id: Idf908ca5ebe2ac5544d8125282d3fd8f13dfba7c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/433961
Reviewed-by: Alexander Aprelev <[email protected]>
Commit-Queue: Ryan Macnak <[email protected]>

Author: rmacnak-google

tools/bots/test_matrix.json

@@ -1659,6 +1659,7 @@
     },
     {
       "builders": [
+        "vm-linux-debug-arm64",
         "vm-linux-release-arm64"
       ],
       "meta": {
@@ -1684,6 +1685,7 @@
     },
     {
       "builders": [
+        "vm-aot-linux-debug-arm64",
         "vm-aot-linux-release-arm64"
       ],
       "meta": {