Summary:
This revision expands test coverage for conditional triggers for UPDATE queries in the context of D34040.
Jira: DB-12637

Test Plan:
Run the following tests:
```
./yb_build.sh --java-test 'org.yb.pgsql.TestPgRegressUpdateOptimized#schedule'
```

Reviewers: smishra

Reviewed By: smishra

Subscribers: yql

Tags: #jenkins-ready

Differential Revision: https://phorge.dev.yugabyte.com/D37691