fix: move DelayedFreeze setImmediate into an effect (#1980)

## Description
Executing side effects in render is usually considered bad manners in
react land, and given concurrent rendering could have unexpected results
if renders are thrown away.

## Changes
This change makes it so setImmediate fires in an effect, and also cleans
up after itself if for whatever reason the callback isn't fired.
(although I think it's probably not possible with how setImmediate is
implemented)

## Screenshots / GIFs
N/A

## Test code and steps to reproduce
We (at Discord) ran essentially this patch for probably over a year now
without issue and figured it might be good to give back.

Here's an issue related to it:
#1198

## Checklist

- [ ] Included code example that can be used to test this change
- [ ] Updated TS types
- [ ] Updated documentation: <!-- For adding new props to native-stack
-->
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/guides/GUIDE_FOR_LIBRARY_AUTHORS.md
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/native-stack/README.md
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/src/types.tsx
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/src/native-stack/types.tsx
- [ ] Ensured that CI passes

src/index.native.tsx

@@ -1,5 +1,5 @@
 /* eslint-disable @typescript-eslint/no-var-requires */
-import React, { PropsWithChildren, ReactNode } from 'react';
+import React, { useEffect, PropsWithChildren, ReactNode } from 'react';
 import {
   Animated,
   Image,
@@ -194,13 +194,14 @@ function DelayedFreeze({ freeze, children }: FreezeWrapperProps) {
   // flag used for determining whether freeze should be enabled
   const [freezeState, setFreezeState] = React.useState(false);
 
-  if (freeze !== freezeState) {
-    // setImmediate is executed at the end of the JS execution block.
-    // Used here for changing the state right after the render.
-    setImmediate(() => {
+  useEffect(() => {
+    const id = setImmediate(() => {
       setFreezeState(freeze);
     });
-  }
+    return () => {
+      clearImmediate(id);
+    }
+  }, [freeze])
 
   return <Freeze freeze={freeze ? freezeState : false}>{children}</Freeze>;
 }