Increase the percentage of `chromium.resultdb.result_sink` experiment to 50

This changes the percentage for both CI and try builders.

Bug: 1108016
Change-Id: I8a6e0e97c4f936f25ac2b9e046142bed1e72e793
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490337Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Chan Li <chanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819469}

infra/config/lib/ci.star

@@ -398,7 +398,7 @@ def ci_builder(
 
     # Enable "chromium.resultdb.result_sink" on all ci builders for 10% by default.
     experiments = experiments or {}
-    experiments.setdefault("chromium.resultdb.result_sink", 10)
+    experiments.setdefault("chromium.resultdb.result_sink", 50)
 
     # Define the builder first so that any validation of luci.builder arguments
     # (e.g. bucket) occurs before we try to use it

infra/config/lib/try.star

@@ -157,7 +157,7 @@ def try_builder(
 
     # Enable "chromium.resultdb.result_sink" on all try builders for 10% by default.
     experiments = experiments or {}
-    experiments.setdefault("chromium.resultdb.result_sink", 10)
+    experiments.setdefault("chromium.resultdb.result_sink", 50)
 
     # Define the builder first so that any validation of luci.builder arguments
     # (e.g. bucket) occurs before we try to use it