[infra] Clean up mb_config after experiments splitting and renaming

Bug: chromium:1136844
Change-Id: I3775eeb9afd447e4c9fc7a2ad6b0365368b89049
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3289153Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77952}

infra/mb/mb_config.pyl

@@ -105,30 +105,30 @@
       'V8 Linux - arm64 - sim - CFI - builder': 'release_simulate_arm64_cfi',
       'V8 Linux - arm64 - sim - MSAN - builder': 'release_simulate_arm64_msan',
       # Misc.
-      'V8 Linux gcc': 'release_x86_gcc',
+      'V8 Linux gcc - builder': 'release_x86_gcc',
       # FYI.
-      'V8 iOS - sim': 'release_x64_ios_simulator',
+      'V8 iOS - sim - builder': 'release_x64_ios_simulator',
       'V8 Linux64 - arm64 - sim - heap sandbox - debug - builder': 'debug_x64_heap_sandbox_arm64_sim',
       'V8 Linux64 - cppgc-non-default - debug - builder': 'debug_x64_non_default_cppgc',
       'V8 Linux64 - debug - perfetto - builder': 'debug_x64_perfetto',
-      'V8 Linux64 - disable runtime call stats': 'release_x64_disable_runtime_call_stats',
+      'V8 Linux64 - disable runtime call stats - builder': 'release_x64_disable_runtime_call_stats',
       'V8 Linux64 - debug - single generation - builder': 'debug_x64_single_generation',
       'V8 Linux64 - pointer compression - builder': 'release_x64_pointer_compression',
       'V8 Linux64 - pointer compression without dchecks':
           'release_x64_pointer_compression_without_dchecks',
       'V8 Linux64 - arm64 - sim - pointer compression - builder':
           'release_simulate_arm64_pointer_compression',
-      'V8 Linux64 gcc - debug': 'debug_x64_gcc',
+      'V8 Linux64 gcc - debug builder': 'debug_x64_gcc',
       'V8 Fuchsia - builder': 'release_x64_fuchsia',
       'V8 Fuchsia - debug builder': 'debug_x64_fuchsia',
       'V8 Linux64 - cfi - builder': 'release_x64_cfi',
       'V8 Linux64 UBSan - builder': 'release_x64_ubsan',
       'V8 Linux - vtunejit': 'debug_x86_vtunejit',
       'V8 Linux64 - gcov coverage': 'release_x64_gcc_coverage',
-      'V8 Linux64 - Fuzzilli': 'release_x64_fuzzilli',
-      'V8 Linux - predictable': 'release_x86_predictable',
+      'V8 Linux64 - Fuzzilli - builder': 'release_x64_fuzzilli',
+      'V8 Linux - predictable - builder': 'release_x86_predictable',
       'V8 Linux - full debug builder': 'full_debug_x86',
-      'V8 Mac64 - full debug': 'full_debug_x64',
+      'V8 Mac64 - full debug builder': 'full_debug_x64',
       'V8 Random Deopt Fuzzer - debug': 'debug_x64',
     },
     'client.v8.clusterfuzz': {