bug: menu can be swiped to open when not on root page

### Prerequisites

- [X] I have read the [Contributing Guidelines](https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#creating-an-issue).
- [X] I agree to follow the [Code of Conduct](https://ionicframework.com/code-of-conduct).
- [X] I have searched for [existing issues](https://github.com/ionic-team/ionic-framework/issues) that already report this problem, without success.

### Ionic Framework Version

- [ ] v4.x
- [ ] v5.x
- [X] v6.x
- [ ] Nightly

### Current Behavior

If you've pushed a few pages onto the stack, swiping from the left edge of the screen should pop pages off the stack. Only when you're at a nav root should swiping from the left expose the side menu.

But if you swipe from the left edge before a push or pop navigation animation has settled, you can drag out the side menu when you're not at the root of the nav stack.

### Expected Behavior

Pushed pages should prevent the side menu swipeGesture from working until you're at the root.

### Steps to Reproduce

This video explains it.

https://youtu.be/qTidttFLsZQ

### Code Reproduction URL

https://github.com/WhatsThatItsPat/sidemenu-available-in-subpage

### Ionic Info

Ionic:

Ionic CLI : 6.19.1
Ionic Framework : not installed
@angular-devkit/build-angular : not installed
@angular-devkit/schematics : not installed
@angular/cli : not installed
@ionic/angular-toolkit : not installed

Capacitor:

Capacitor CLI : not installed
@capacitor/android : not installed
@capacitor/core : not installed
@capacitor/ios : not installed

Utility:

cordova-res : not installed globally
native-run : 1.5.0

System:

NodeJS : v16.13.2
npm : 8.1.2
OS : macOS Big Sur

### Additional Information

_No response_

Start with the linked reproduction repository and video to reproduce the side-menu gesture during an unsettled navigation animation. Trace the Ionic navigation and menu gesture handling involved, then verify that pushed pages block the menu swipe until navigation returns to a root page.

Written by the indexing model from the issue text.