Importing a collection now creates duplicate requests

### Expected Behavior

When a collection is imported into an existing collection, any requests that already exist are updated/not modified, like 2023.1.0

### Actual Behavior

Requests are duplicated

### Reproduction Steps

1. Create a new collection
2. Create a new request
3. Export the collection to a file
4. Import the collection from the file into the same collection

You end up with a copy of the requests, previous versions of insomnia merged/updated the request rather than creating a duplicate

### Is there an existing issue for this?

- [X] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Additional Information

_No response_

### Insomnia Version

2023.2.0

### What operating system are you using?

macOS

### Operating System Version

ventura 13.3.1

### Installation method

download from site

### Last Known Working Insomnia version

2023.1.0

Reproduce the import flow by exporting a collection and importing it back into the same collection, then compare the result with Insomnia 2023.1.0. Trace the collection import entry point and determine where existing requests are matched; done means re-importing does not create duplicate requests and existing requests are preserved or updated.

Written by the indexing model from the issue text.