Removed dependency on using sql_run_id to detect slave reset.
Using server binlog_relay_io_observer callback interface
for monitoring startup of replication applier.
This makes it possible to detect slave start/restart without using
sql_run_id.
Removed call interface to read server sql_run_id.
The code does now not rely on using work-around introduced by Bug#31357022
which effectively tests the solution when the slave is initialized for each
test case.

Reviewed-by: Frazer Clement <frazer.clement@oracle.com>