Summary:
PgSharedMemTest uses 6s read/write timeout in sanitizer mode.
But sometimes read during create table takes more time and tests fail.
Increase read/write timeout to 10s in sanitizer mode.
Jira: DB-10305

Test Plan: ./yb_build.sh tsan --gtest_filter PgSharedMemTest.Batches -n 20

Reviewers: bogdan

Reviewed By: bogdan

Subscribers: ybase, yql

Differential Revision: https://phorge.dev.yugabyte.com/D33098