Summary:
This diff skips running `org.yb.pgsql.TestPgRegressLock#testIsolation` test with connection manager as it's not suitable for it. `yb.port.deadlock-soft` test was failing with connection manager as test goes into a wrong deadlock state.
With conn mgr, the abort heartbeat is being sent to wrong transaction and it's decided based on the start time of the transactions. The one which was started earliest gets the hearbeat from doc db. It's better to skip the test with conn mgr.

Test Plan: Jenkins: build type: fastdebug, test regex: TestPgRegressLock

Reviewers: bkolagani, arpit.saxena

Reviewed By: bkolagani

Subscribers: jason, yql

Differential Revision: https://phorge.dev.yugabyte.com/D54012