fix: revert experimental flag change to fix BCR presubmit (#691)

[BCR presubmit
failure](https://buildkite.com/bazel/bcr-presubmit/builds/2306#018b6856-fd5e-4b6a-8a84-a0360fd7d6aa)

Author: cgrindel

shared.bazelrc

@@ -25,7 +25,7 @@ build:cache --experimental_remote_cache_async
 build:cache --experimental_remote_cache_compression
 
 # Recommended by BuildBuddy
-build --remote_build_event_upload=minimal
+build --experimental_remote_build_event_upload=minimal
 build --noslim_profile 
 build --experimental_profile_include_target_label 
 build --experimental_profile_include_primary_output