Enable BQ Exports for test results in all chromium.try

R=chanli,bpastene,nodir,agable

Bug: 1074031
Change-Id: I9c5529cf44ab4909a85a09fb3fe2b593b1b16bfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163421Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Roberto Carrillo <robertocn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762103}

infra/config/lib/try.star

@@ -210,6 +210,9 @@ def try_builder(
   # (e.g. bucket) occurs before we try to use it
   ret = builders.builder(
       name = name,
+      resultdb_bigquery_exports = [resultdb.export_test_results(
+          bq_table = 'luci-resultdb.chromium.try_test_results',
+      )],
       **kwargs
   )