chore(router-outlet): rename files (#28074)

Issue number: N/A

---------

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## What is the current behavior?
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Router outlet files can be hard to find when searching for them.

## What is the new behavior?
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this PR. -->

- Router outlet files are named what you'd expect.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

core/src/components/router-outlet/router-outlet.tsx

@@ -20,7 +20,7 @@ import type { RouteID, RouterDirection, RouteWrite, NavOutlet } from '../router/
 
 @Component({
   tag: 'ion-router-outlet',
-  styleUrl: 'route-outlet.scss',
+  styleUrl: 'router-outlet.scss',
   shadow: true,
 })
 export class RouterOutlet implements ComponentInterface, NavOutlet {

core/src/utils/test/overlays/overlays.spec.ts

@@ -1,7 +1,7 @@
 import { newSpecPage } from '@stencil/core/testing';
 
 import { Nav } from '../../../components/nav/nav';
-import { RouterOutlet } from '../../../components/router-outlet/route-outlet';
+import { RouterOutlet } from '../../../components/router-outlet/router-outlet';
 import { setRootAriaHidden } from '../../overlays';
 
 describe('setRootAriaHidden()', () => {