[dart/fuzzer] Deprecate DBC nightly runs in fuzzer

Rationale:
Deprecating DBC cluster runs in fuzzer since the
focus will move away from this mode. Our resources
are better spent on running all other modes.
Change-Id: I6938381fa59c5d40928d891b08725fdf7c54cece
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/106921
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>

runtime/tools/dartfuzz/dartfuzz_test.dart

@@ -534,14 +534,10 @@ class DartFuzzTestSession {
     'jit-debug-x64',
     'jit-debug-arm32',
     'jit-debug-arm64',
-    'jit-debug-dbc',
-    'jit-debug-dbc64',
     'jit-ia32',
     'jit-x64',
     'jit-arm32',
     'jit-arm64',
-    'jit-dbc',
-    'jit-dbc64',
     'aot-debug-x64',
     'aot-x64',
     'kbc-int-debug-x64',
@@ -554,6 +550,11 @@ class DartFuzzTestSession {
 
   // Modes not used on cluster runs because they have outstanding issues.
   static const List<String> nonClusterModes = [
+    // Deprecated.
+    'jit-debug-dbc',
+    'jit-debug-dbc64',
+    'jit-dbc',
+    'jit-dbc64',
     // Times out often:
     'aot-debug-arm32',
     'aot-debug-arm64',

tools/bots/test_matrix.json

@@ -100,15 +100,11 @@
       "out/DebugIA32/",
       "out/DebugSIMARM/",
       "out/DebugSIMARM64/",
-      "out/DebugSIMDBC/",
-      "out/DebugSIMDBC64/",
       "out/DebugX64/",
       "out/ProductX64/",
       "out/ReleaseIA32/",
       "out/ReleaseSIMARM/",
       "out/ReleaseSIMARM64/",
-      "out/ReleaseSIMDBC/",
-      "out/ReleaseSIMDBC64/",
       "out/ReleaseX64/",
       "third_party/pkg/",
       "third_party/pkg_tested/",
@@ -2063,7 +2059,7 @@
           "script": "tools/build.py",
           "arguments": [
             "--mode=debug,release",
-            "--arch=ia32,simarm,simdbc,simdbc64",
+            "--arch=ia32,simarm",
             "runtime"
           ]
         },