FR: Firebase Performance Web doesn't report traces in iOS Capacitor app (but works in Android Capacitor app)

### [REQUIRED] Describe your environment

* Operating System version: iOS 14.3
* Browser version: Safari (WKWebView)
* Firebase SDK version: firebase@8.2.1
* Firebase Product: performance

### [REQUIRED] Describe the problem

#### Steps to reproduce:

1. Install a Hello World Capacitor app (https://capacitorjs.com/), add a Firebase SDK (using a bundler), config for a WebApp
2. Do a `firebase.performance().trace('myTrace').record(Date.now(), 100)`
3. See that in Safari Network tab it logs trace events (see screenshot further).
4. Even after 24 hours, Firebase Performance Console doesn't show any Traces (and any other Events) from iOS. But works perfectly with Android.


Payload in this call

```
{
"request_time_ms": "1609169136407",
"client_info": {
"client_type": 1,
"js_client_info": {}
},
"log_source": 462,
"log_event": [
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"event_time_ms": "1609169131412"
},
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},
{
"source_extension_json_proto3": "{\"application_info\":{\"google_app_id\":\"1:712514701016:web:8b5e826255e345c6\",\"app_instance_id\":\"chciZivQcR6FlBZQ0xkVjc\",\"web_app_info\":{\"sdk_version\":\"0.4.5\",\"page_url\":\"capacitor://localhost/intro\",\"service_worker_status\":1,\"visibility_state\":1,\"effective_connection_type\":0},\"application_process_state\":0},\"network_request_metric\":{\"url\":\"https://realtime-696-stg.optimove.net/reportEvent\",\"http_method\":0,\"http_response_code\":200,\"client_start_time_us\":1609169131553000,\"time_to_response_completed_us\":36000}}",
"event_time_ms": "1609169131602"
},
{
"source_extension_json_proto3": "{\"application_info\":{\"google_app_id\":\"1:712514701016:web:8b5e826255e345c6\",\"app_instance_id\":\"chciZivQcR6FlBZQ0xkVjc\",\"web_app_info\":{\"sdk_version\":\"0.4.5\",\"page_url\":\"capacitor://localhost/intro\",\"service_worker_status\":1,\"visibility_state\":1,\"effective_connection_type\":0},\"application_process_state\":0},\"network_request_metric\":{\"url\":\"https://realtime-696-stg.optimove.net/reportEvent\",\"http_method\":0,\"http_response_code\":200,\"client_start_time_us\":1609169131555000,\"time_to_response_completed_us\":38000}}",
"event_time_ms": "1609169131603"
},
{
"source_extension_json_proto3": "{\"application_info\":{\"google_app_id\":\"1:712514701016:web:8b5e826255e345c6\",\"app_instance_id\":\"chciZivQcR6FlBZQ0xkVjc\",\"web_app_info\":{\"sdk_version\":\"0.4.5\",\"page_url\":\"capacitor://localhost/intro\",\"service_worker_status\":1,\"visibility_state\":1,\"effective_connection_type\":0},\"application_process_state\":0},\"network_request_metric\":{\"url\":\"https://o94439.ingest.sentry.io/api/5385981/store/\",\"http_method\":0,\"http_response_code\":200,\"client_start_time_us\":1609169131616000,\"time_to_response_completed_us\":390999}}",
"event_time_ms": "1609169132017"
},
{
"source_extension_json_proto3": "{\"application_info\":{\"google_app_id\":\"1:712514701016:web:8b5e826255e345c6\",\"app_instance_id\":\"chciZivQcR6FlBZQ0xkVjc\",\"web_app_info\":{\"sdk_version\":\"0.4.5\",\"page_url\":\"capacitor://localhost/intro\",\"service_worker_status\":1,\"visibility_state\":1,\"effective_connection_type\":0},\"application_process_state\":0},\"trace_metric\":{\"name\":\"firstIdle\",\"is_auto\":false,\"client_start_time_us\":1609169130521000,\"duration_us\":5627000,\"custom_attributes\":{\"appVer\":\"4.0.8\",\"buildInfoVer\":\"20201228_1525\",\"cordova\":\"true\",\"platform\":\"IOS\"}}}",
"event_time_ms": "1609169136152"
}
]
}
```

Response:
```
{
"nextRequestWaitMillis": "10000",
"logResponseDetails": [
{
"responseAction": "DELETE_REQUEST"
}
]
}
```

When debugging the same app deployed to Netlify, it logs very similar payload (difference is that `page_url` is set to e.g `https://myapp.netlify.app/home` instead of `capacitor://localhost/home`), and exactly same response.

Can it be that Firebase Backend somehow silently rejects urls like `capacitor://localhost/home`? But, actually, the url is exactly the same when installed on Android, and there it works just fine.

Previously, before we upgraded Cordova to Capacitor, we had the same issue (worked just fine on Android, but not on iOS, since iOS 10.0).

I have studied the source code of `@firebase/performance` quite thoroughly over the last year, but cannot really find any clues of what can be wrong.