Summary:
Fixed concurrent access to access_logging_enabled and tcmalloc_logging_enabled.

Also fixed access to rpcz and ybrpczMemoryContext in webserver_worker_main in yb_pg_metrics.c.
Jira: DB-13615

Test Plan: ./yb_build.sh tsan --gtest_filter PgCatalogPerfTest.ResponseCacheInvalidationOnConnectionWithTempTableClosure

Reviewers: telgersma

Reviewed By: telgersma

Subscribers: ybase, yql

Tags: #jenkins-ready

Differential Revision: https://phorge.dev.yugabyte.com/D39336