change of tenant for multi tenancy using pgxpool

[yakkalabhargav235]

Hi @jackc , previous discussions had conveyed in wrong way in the issue https://github.com/jackc/pgx/issues/2007.
As per the suggestions given in previous chat. I had tried by setting up DefaultQueryExecMode to QueryExecModeSimpleProtocol. which results in creating a new connection every time and does not releases the connections after executing query.
I had removed the immutable from procedures. Everything is working as expected.
But only query is when procedures are immutable, the results of pgx are not matched with results using jdbc. May I know the reason?