Remove overridden methods with exact same parent (#35084)

Removes 2 overriden class methods where the overridden code is exactly the same, with no visibility, parameter, or return type differences.

 - `\Illuminate\Database\Console\Migrations\MigrateMakeCommand::usingRealPath` is identical to the parent `\Illuminate\Database\Console\Migrations\BaseCommand::usingRealPath`.
 - `\Illuminate\Database\Eloquent\Relations\MorphTo::disassociate` is identical to the parent `\Illuminate\Database\Eloquent\Relations\BelongsTo::disassociate`.

Similar code in fakes or mixins are not removed.