mobile: disable some virtual cluster stats (#24470)

Commit Message:
Additional Description: Disable `upstream_rq_timeout` (this one does not work, see #23867), `upstream_rq_retry_success`, `upstream_rq_retry_overflow` and `upstream_rq_retry_limit_exceeded` stats to limit the number of stats that's created per every virtual cluster that Envoy Mobile is configured to start with. The list is somehow arbitrary and should eventually be moved out of the main config #24459. Reducing their number because of the performance concerns as stats as created as part of the virtual cluster creation which happens on app launch.
Risk Level: Low
Testing:
Docs Changes:
Release Notes:
Platform Specific Features:
[Optional Runtime guard:]
[Optional Fixes #Issue]
[Optional Fixes commit #PR or SHA]
[Optional Deprecated:]
[Optional [API Considerations](https://github.com/envoyproxy/envoy/blob/main/api/review_checklist.md):]

mobile/library/common/config/config.cc

@@ -503,7 +503,7 @@ stats_sinks: *stats_sinks
         - safe_regex:
             regex: '^pulse.*'
         - safe_regex:
-            regex: '^vhost\.[\w]+\.vcluster\.[\w]+?\.upstream_rq_(?:[12345]xx|[3-5][0-9][0-9]|retry.*|timeout|total)'
+            regex: '^vhost\.[\w]+\.vcluster\.[\w]+?\.upstream_rq_(?:[12345]xx|[3-5][0-9][0-9]|retry|total)'
   use_all_default_tags:
     false
 watchdogs: