Add check for `->searchable()` for relationships

[dissto]

For example

it('can sort column', function (string $column) {
    Transaction::factory(3)->create();

    livewire(ListTransactions::class)
        ->sortTable($column)
        ->assertCanSeeTableRecords(Transaction::orderBy($column)->get(), inOrder: true)
        ->sortTable($column, 'desc')
        ->assertCanSeeTableRecords(Transaction::orderBy($column, 'desc')->get(), inOrder: true);
})->with(['amount', 'enteredBy.name', 'created_at', 'updated_at'])->group('resource', 'page', 'index', 'table', 'column');


// 
public static function getEnteredByColumn(): TextColumn
{
    return TextColumn::make('enteredBy.name')
        ->searchable()
        ->label(__('resources/transaction.table.columns.entered_by.label'))
        ->sortable();
}

//
public function enteredBy(): BelongsTo
{
    return $this->belongsTo(User::class, 'entered_by_id');
}

will blow up with Illuminate\Database\QueryException: SQLSTATE[HY000]: General error: 1 no such column: enteredBy.name (Connection: sqlite, SQL: select * from "transactions" where "transactions"."deleted_at" is null order by "enteredBy"."name" asc)

[CodeWithDennis]

I had a problem like this before. When we use relationships, it can cause errors. But if we use eloquent to sort, it might fail because it's sensitive to capitalization. Maybe we should split the tests into ones with relationships and ones without.