chore: remove matchMedia check (#28783)

Issue number: Internal

---------

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## What is the current behavior?
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As part of FW-2832 the team has an initiative to remove much of the
`any` usage in favor of stronger types. This will make modifications to
this codebase safer as we will have access to proper type checking.


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

- Removed the `any` case from window.matchMedia. This causes the linter
to fail because `window.matchMedia` is always defined. I removed the
check altogether. `matchMedia` is supported on all browsers that Ionic 7
supports. This should not cause any changes for Ionic developers, but I
want to ship this a) in a separate patch and b) in a minor release to
de-risk just in case there's an edge case I am not considering

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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

core/src/components/split-pane/split-pane.tsx

@@ -112,18 +112,17 @@ export class SplitPane implements ComponentInterface {
       return;
     }
 
-    if ((window as any).matchMedia) {
     // Listen on media query
     const callback = (q: MediaQueryList) => {
       this.visible = q.matches;
     };
 
     const mediaList = window.matchMedia(mediaQuery);
+    // TODO FW-5869
     (mediaList as any).addListener(callback as any);
     this.rmL = () => (mediaList as any).removeListener(callback as any);
     this.visible = mediaList.matches;
   }
-  }
 
   private isPane(element: HTMLElement): boolean {
     if (!this.visible) {