[google-maps] remote marker shows default marker on IOS when marker not yet loaded

## Bug Report

### Plugin(s)
```
"@capacitor/google-maps": "^5.3.3"
```

### Capacitor Version
```
Latest Dependencies:

@capacitor/cli: 5.6.0
@capacitor/core: 5.6.0
@capacitor/android: 5.6.0
@capacitor/ios: 5.6.0

Installed Dependencies:

@capacitor/cli: 5.0.4
@capacitor/core: 5.0.4
@capacitor/android: 5.0.4
@capacitor/ios: 5.0.4
```

### Platform(s)
IOS

### Current Behavior
When a remote marker is loaded the IOS device is showing the red default marker until the image is loaded. The red default marker is also shown even if tintColor is used with `tintColor: { r: 1, g: 1, b: 1, a: 1 }`. Not sure if this is a but or a feature like this ionic-team/capacitor-google-maps#118

### Expected Behavior
The red defaut marker should not be displayed.

### Code Reproduction
https://stackblitz.com/edit/angular-yz24zb-xzeuvj?file=src%2Fapp%2Fexample.component.ts

1. add API KEY to componentn: `const apiKey = 'xxx';`
2. build app to IOS
3. run on real device
4. see before marker is loaded, the red default marker is visible

### Other Technical Details
Reproduction code can be downloaded from stackblitz

# Note
I remembered that there was this fix: ionic-team/capacitor-plugins#1667 - that was fixed in a previous release. Before the main thread was blocked so that the user couldn't interact anymore with the map until the remote marker was loaded. Now there is a new issue that the user can interact with the map, but the default red marker is shown until the remote marker is now loaded, which is also not an expected behavior.