[8.x] Fix undefined array key in SqlServerGrammar when using orderByRaw

[Namoshek]

This PR fixes the exception

ErrorException: Undefined array key "column" in /var/www/vendor/laravel/framework/src/Illuminate/Database/Query/Grammars/SqlServerGrammar.php:220

which is triggered when using orderByRaw after the latest changes to the SqlServerGrammar.

---

A bit of background (and please correct me if I'm wrong):

When using Builder::orderBy($column, $direction), an order is added with keys column and direction (line 1986+):

framework/src/Illuminate/Database/Query/Builder.php

Lines 1970 to 1992 in 855a919

	public function orderBy($column, $direction = 'asc')
	{
	if ($this->isQueryable($column)) {
	[$query, $bindings] = $this->createSub($column);
	$column = new Expression('('.$query.')');
	$this->addBinding($bindings, $this->unions ? 'unionOrder' : 'order');
	}
	$direction = strtolower($direction);
	if (! in_array($direction, ['asc', 'desc'], true)) {
	throw new InvalidArgumentException('Order direction must be "asc" or "desc".');
	}
	$this->{$this->unions ? 'unionOrders' : 'orders'}[] = [
	'column' => $column,
	'direction' => $direction,
	];
	return $this;
	}

When using Builder::orderByRaw($sql), an order is added with keys type and sql (line 2051):

framework/src/Illuminate/Database/Query/Builder.php

Lines 2045 to 2054 in 855a919

	public function orderByRaw($sql, $bindings = [])
	{
	$type = 'Raw';
	$this->{$this->unions ? 'unionOrders' : 'orders'}[] = compact('type', 'sql');
	$this->addBinding($bindings, $this->unions ? 'unionOrder' : 'order');
	return $this;
	}

Because of this, the patched code currently fails with an exception.

[driesvints]

Can you provide a test?

[Namoshek]

I added a test case based on the generic one above the new one. The interesting part is the last query which uses limit/offset and orderByRaw. The other queries also work without the patch, but I guess having more test cases is no harm.

The issue is pretty easy to trigger when having a table with a slightly complex column design (e.g. sorting by enums).