Run all tests on vm-dyn-linux-debug-x64 configuration

Change-Id: I660787d59b9cb905e5309f07d8aa4de69690c847
Cq-Include-Trybots: luci.dart.try:vm-aot-dyn-linux-debug-x64-try,vm-aot-dyn-linux-product-x64-try,vm-dyn-linux-debug-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/444369
Reviewed-by: Ryan Macnak <[email protected]>
Commit-Queue: Alexander Markov <[email protected]>

Author: alexmarkov

tools/bots/test_matrix.json

@@ -1335,14 +1335,12 @@
           "name": "vm tests",
           "arguments": [
             "-nvm-dyn-${system}-${mode}-${arch}",
-            "corelib",
-            "language",
+            "--default-suites",
             "co19",
-            "vm",
             "pkg/vm_service/"
           ],
           "fileset": "vm",
-          "shards": 5
+          "shards": 16
         },
         {
           "name": "dynamic module tests",