bug(drag-drop): cdkDropListSortingDisabled interacts badly with connected lists

#### Reproduction

This is a fork of the "disable sorting" example from the docs.

https://stackblitz.com/edit/angular-lcgpvd?file=src/app/cdk-drag-drop-disabled-sorting-example.ts

Steps to reproduce:
1. Open example
2. Drag an item from one list to another

#### Expected Behavior

One of the following, internally-consistent behaviors:

* the receiving list provides some way of determining where the incoming item will be sorted
* the incoming item always goes before the first item
* the incoming item always goes after the last item

#### Actual Behavior

The incoming item gets a placeholder wherever the user drags it, but then can't be moved. The user can continue dragging back to the original list, so the placeholder goes back to the original position then drag over the target list again to put the placeholder in a new position -- but again, can't move the placeholder directly.

#### Environment

- Angular: 12.2.9
- CDK/Material: 12.2.9
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): Win10

#### Comments

I'd like to see the first behavior implemented -- let me supply a sort-function that gets the dragged item's `data` (and maybe the index in its current container?) as an input and outputs the list index at which the placeholder should be inserted. Failing that, I'd at least like a property that lets me say that, since sorting is disabled, the placeholder should go at the "start" or "end".

从链接的 StackBlitz 示例 src/app/cdk-drag-drop-disabled-sorting-example.ts 开始，在禁用排序的情况下复现列表之间的拖动。然后跟踪 CDK drag-drop 的连接列表行为，该行为会放置占位符。完成标准是选择并实现一种一致的接收列表行为，并为报告的复现提供覆盖。

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