UIKit VC spans run into timeout if view never becomes visible

### Problem Statement

If a UIKit VC is initialized, a span is created to capture the lifecycle of the VC.
For subsequent passes through UI lifecycle events (`viewDidLoad`, `viewWillAppear`, etc.), sub-spans are created.

In cases where the view never becomes visible (i.e. `viewWillAppear` is never invoked), the main span of the VC runs until the end of the set timeout. This creates non-helpful spans.

### Solution Brainstorm

One of the following:
1. Only report VC spans if they pass at least `viewWillAppear`
2. Trim the VC span to the last lifecycle event span

### Are you willing to submit a PR?

_No response_