[router] fix router.push inside a group

[marklawlor]

Why

Fix: #26669
Close: #26597

How

#26597 correctly identified that we need to deep compare the params. I cleaned up the logic and added unit tests which are a minimal reproduction of #26669

Test Plan

The navigation.test.ios.tsx file is getting a bit messy, so I created a new push.test.ios.tsx file. Over time I'm going to separate the rest of the navigation tests into a push/navigate/replace files.

See comments for more information

Blocked by

#26710 - Screens with search parameters are being incorrectly handled
PR pending - Screens are not being hoisted correctly. This causes the push to behave incorrectly as the screen is not within the expected _layout

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[marklawlor]

This test is a simplified version of #26669. There were two problems

1. It targeted based upon name, so it always targeted (group)/_layout
2. Once that was fixed it didn't target correctly based upon different params, e.g user/2 was targeting the <Stack /> inside user/1/_layout instead of (group)/_layout

Because of the incorrect target, Screens were being nested instead of pushed (hence why they switched instead of animated).

This test shows they are always being pushed

[EvanBacon]

Suggested change

	return valueA === valueB || valueA?.toString?.() === valueB?.toString?.();
	return valueA == valueB

If we're comparing numbers and strings, it would be cheaper to use == than to optionally convert to string.

[EvanBacon]

Looks good, assuming tests pass.

[kennethstarkrl]

@marklawlor This fixes routing pushing to slug routes, however, there is still a bug for the same thing but with url query params. ie route/to/slug**?query=test** Looks like url queries aren't included in the params object.

[marklawlor]

This is currently blocked by a number of small changes that I need to make. I'll update the description as a post new PRs