[MAUI] Local scope tags leak into subsequent HttpClient auto captured events

### Package

Sentry

### .NET Flavor

.NET

### .NET Version

8.0.16

### OS

macOS

### OS Version

_No response_

### Development Environment

Visual Studio v17.x

### SDK Version

5.16.0

### Self-Hosted Sentry Version

_No response_

### Workload Versions

n/a

### UseSentry or SentrySdk.Init call

```
.UseSentry(options =>
{
options.Dsn = "";
options.TracesSampleRate = 1.0;
options.CaptureFailedRequests = true;
options.FailedRequestStatusCodes.Add((400, 499));
})
```

### Steps to Reproduce

Reported via [Zendesk ticket](https://sentry.zendesk.com/agent/tickets/164186): Tags set inside the local scope callback of `SentrySdk.CaptureException(error, scope => { ... })` are appearing on automatically captured HttpClient events. The tag (lats.EventName) is only set within the local callback and not configured globally, and it bleeds into later auto captured events.

Make a failing HTTP request (404) inside a try/catch. In catch, call:
`SentrySdk.CaptureException(ex, scope => { scope.SetTags(SetExtra(apiMethod, "http.error")); });`
This correctly sends an event with tag lats.EventName=testtag.

Make another failing HTTP request (500). The[ HttpClient integration](https://docs.sentry.io/platforms/dotnet/guides/maui/configuration/http-client-errors/) automatically captures an event.
That event still includes the tag lats.EventName=testtag even though it wasn’t set globally.

### Expected Result

Tags set in a local scope callback should not bleed to other automatically captured events.

### Actual Result

The automatically captured HttpClient event inherits tags from the local scope, even though that scope should have been isolated.