[11.x] Fix dumping migrations table with schema or prefixed name

[hafezdivandari]

Alternative to #52076

Dump command uses hasMigrationTable() method to determine if the migrations table exists before dumping its data, this methods call Schema::hasTable() under the hood which handles the table's prefix and schema name on PostgreSQL.

This PR fixes 2 related problems:

1. Makes sure the migrations table name used on hasMigrationTable() is without prefix, otherwise the table name will get prefixed twice and not be found.
2. On PostgreSQL, it makes sure that the dump command respects the schema name the same way that Schema::hasTable() does; Otherwise we are checking if migrations table exists within the search_path and dump it from default schema instead!

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