Disable `chromium.resultdb.result_sink` experiment on try builders

It breaks "Build Recipes Tester"

Bug: 1141272

Change-Id: I24708d22aea1852ddb08fe105d48c65727738d17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491681Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Chan Li <chanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819691}

infra/config/lib/ci.star

@@ -396,7 +396,7 @@ def ci_builder(
     ]
     merged_resultdb_bigquery_exports.extend(resultdb_bigquery_exports or [])
 
-    # Enable "chromium.resultdb.result_sink" on all ci builders for 10% by default.
+    # Enable "chromium.resultdb.result_sink" on all ci builders for 50% by default.
     experiments = experiments or {}
     experiments.setdefault("chromium.resultdb.result_sink", 50)
 

infra/config/lib/try.star

@@ -155,9 +155,9 @@ def try_builder(
     if not branches.matches(branch_selector):
         return
 
-    # Enable "chromium.resultdb.result_sink" on all try builders for 10% by default.
+    # Disable "chromium.resultdb.result_sink" on all try builders by default.
     experiments = experiments or {}
-    experiments.setdefault("chromium.resultdb.result_sink", 50)
+    experiments.setdefault("chromium.resultdb.result_sink", 0)
 
     # Define the builder first so that any validation of luci.builder arguments
     # (e.g. bucket) occurs before we try to use it