Remove query_rewrite_enabled check from connect

[nj1973]

Connect currently displays settings for the following init params:

    db_parameters = [
        "processes",
        "sessions",
        "query_rewrite_enabled",
        "_optimizer_cartesian_enabled",
    ]

We should definitely remove query_rewrite_enabled and probably remove _optimizer_cartesian_enabled because we didn't document why we display it (might have been due to dba_extents query issues).

I believe processes and sessions were checked to encourage the user to understand if they had headroom for extra workload.

In practice - these settings are ignored in connect output and I think the whole "Oracle Parameters" section should be removed.