Remove v8_linux64_msan_rel trybot with legacy format

Bug: v8:10445
Change-Id: Ie0d34e2f4afb497c25544bc015d47e42e290f79d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2259939Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68483}

infra/mb/mb_config.pyl

@@ -233,7 +233,6 @@
       'v8_linux64_verify_csa_rel_ng': 'release_x64_verify_csa',
       'v8_linux64_asan_rel_ng': 'release_x64_asan_minimal_symbols',
       'v8_linux64_cfi_rel_ng': 'release_x64_cfi',
-      'v8_linux64_msan_rel': 'release_simulate_arm64_msan_minimal_symbols',
       'v8_linux64_msan_rel_ng': 'release_simulate_arm64_msan_minimal_symbols',
       'v8_linux64_sanitizer_coverage_rel':
           'release_x64_asan_minimal_symbols_coverage',

infra/testing/builders.pyl

@@ -351,15 +351,6 @@
       {'name': 'mjsunit', 'variant': 'stress_snapshot'},
     ],
   },
-  'v8_linux64_msan_rel': {
-    'swarming_dimensions' : {
-      'os': 'Ubuntu-16.04',
-    },
-    'tests': [
-      {'name': 'test262', 'variant': 'default', 'shards': 2},
-      {'name': 'v8testing', 'shards': 5},
-    ],
-  },
   'v8_linux64_msan_rel_ng_triggered': {
     'swarming_dimensions' : {
       'os': 'Ubuntu-16.04',