Authorization Header not read when importing a Postman file

### Expected Behavior

When importing a Collection, headers named "Authorization" are ignored, instead of being added as a header or being added as an "API Key Auth" with `KEY: Authorization`, `VALUE: {{value}}` and `ADD TO: Header`

### Actual Behavior

The header is completely ignored. This is a problem when importing a large collection, as there is no way to edit the Authorization or Header of many requests simultaneously without the use of a plugin. See example below

### Reproduction Steps

1. Copy the following JSON schema (taken from a bigger collection found [here](https://schema.getpostman.com/json/collection/v2.0.0/collection.json)):
```json
{
"info": {
"name": "Mirakl seller API: mmp",
"schema": "https://schema.getpostman.com/json/collection/v2.0.0/collection.json"
},
"variables": [],
"item": [
{
"name": "example",
"request": {
"method": "get",
"url": {
"raw": "{{URL}}/api/document-request/:document_request_id/lines",
"host": ["{{URL}}"],
"path": [
"",
"api",
"document-request",
":document_request_id",
"lines"
],
"variable": [{ "key": ":document_request_id", "value": "value" }],
"query": [{ "key": "shop_id", "value": "", "disabled": true }]
},
"header": [
{ "key": "Authorization", "value": "{{APIKEY}}" },
{ "key": "Accept", "value": "application/json" }
],
"body": {}
},
"response": []
}
]
}

```
2. go to Home on the Insomnia App
3. click on "Create" > "Import from Clipboard"
4. Select "Import as Request Collection"
5. Notice how the request has no Header corresponding to the "Authorization" key, as well as no Auth Key

### 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

2023.1.0

### What operating system are you using?

macOS

### Operating System Version

12.6.2

### Installation method

Website

### Last Known Working Insomnia version

_No response_

Start by reproducing the issue through Home > Create > Import from Clipboard, then select Import as Request Collection with the supplied Postman JSON. Trace the Postman collection import path and verify that the Authorization entry is preserved as a header or API Key Auth while other headers still import correctly.

Written by the indexing model from the issue text.