Ensure order by overrides global scope

[spawnia]

This test shows the behaviour of applying an order by clause that conflicts with a global scope.
Prior to #37582, the overriden order by clause had precedence. Now, only the clause from the global scope is applied.

This behavioural change broke our application and I believe it should be fixed.

[driesvints]

Please note that your PR won't be reviewed when it's in draft. Tests are also failing it seems.

[spawnia]

Tests are also failing it seems.

That's the point of this PR. I skipped right past creating an issue and went straight to providing a failing test case.

[spawnia]

Here is the test output with #37582 reverted:

1) Illuminate\Tests\Database\DatabaseEloquentGlobalScopesTest::testOrderByOverridesGlobalScope
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'select * from "table" order by "name" desc'
+'select * from "table" order by "name" desc, "name" asc'

/home/bfranke/projects/laravel-framework/tests/Database/DatabaseEloquentGlobalScopesTest.php:45

As you can see, the order by clause is duplicated - but the latter has precedence!

[taylorotwell]

Reverted that entire PR.