Replace all tryserver.v8 entries with corresponding LUCI bucket

TBR=machenbach@chromium.org

No-Try: true
Bug: chromium:797083
Change-Id: I6376f1bd652dd20fb44f551e029ce8b71eba7545
Reviewed-on: https://chromium-review.googlesource.com/842866
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50296}

PRESUBMIT.py

@@ -430,6 +430,6 @@ def PostUploadHook(cl, change, output_api):
   return output_api.EnsureCQIncludeTrybotsAreAdded(
       cl,
       [
-        'master.tryserver.v8:v8_linux_noi18n_rel_ng'
+        'luci.v8.try:v8_linux_noi18n_rel_ng'
       ],
       'Automatically added noi18n trybots to run tests on CQ.')