[infra] Add arm64 back to gcc testing.

This was broken during Jammy but this builder now runs on Noble.

Cq-Include-Trybots: luci.dart.try:vm-gcc-linux-try
Change-Id: I39e4a1f924620723d36dad79383637fe5b62add7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/432760
Reviewed-by: Alexander Aprelev <[email protected]>
Commit-Queue: Ryan Macnak <[email protected]>

Author: rmacnak-google

tools/bots/test_matrix.json

@@ -1420,6 +1420,17 @@
             "runtime_precompiled"
           ]
         },
+        {
+          "name": "build dart debug arm64",
+          "script": "tools/build.py",
+          "arguments": [
+            "--mode=debug",
+            "--arch=arm64",
+            "--no-clang",
+            "runtime",
+            "runtime_precompiled"
+          ]
+        },
         {
           "name": "build dart debug riscv64",
           "script": "tools/build.py",
@@ -1453,6 +1464,17 @@
             "runtime_precompiled"
           ]
         },
+        {
+          "name": "build dart release arm64",
+          "script": "tools/build.py",
+          "arguments": [
+            "--mode=release",
+            "--arch=arm64",
+            "--no-clang",
+            "runtime",
+            "runtime_precompiled"
+          ]
+        },
         {
           "name": "build dart release riscv64",
           "script": "tools/build.py",