Remove some reference to the SyzyAsan trybots

These bots don't exist anymore.

Change-Id: Ia0554e83190a02184b5c53875d2aa1380498edfb
Reviewed-on: https://chromium-review.googlesource.com/c/1321210Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605869}

infra/config/global/cr-buildbucket.cfg

@@ -3183,7 +3183,6 @@ buckets {
       name: "win_chromium_dbg_ng"
       execution_timeout_secs: 14400 # 4h
     }
-    builders { mixins: "win-try" name: "win_chromium_syzyasan_rel" }
     builders { mixins: "win-try" name: "win_chromium_x64_rel_ng" }
     builders { mixins: "win-try" name: "win_mojo" }
     builders { mixins: "win-optional-gpu-try" name: "win_optional_gpu_tests_rel" }

infra/config/global/luci-milo.cfg

@@ -5052,9 +5052,6 @@ consoles {
   builders {
     name: "buildbucket/luci.chromium.try/win_chromium_dbg_ng"
   }
-  builders {
-    name: "buildbucket/luci.chromium.try/win_chromium_syzyasan_rel"
-  }
   builders {
     name: "buildbucket/luci.chromium.try/win_chromium_x64_rel_ng"
   }