chore(sample): Update Expo sample to SDK 50 beta 0

[krystofwoldrich]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

This PR updates the Expo sample to the latest Expo SDK 50 beta 0.

It also adds expo-router and Metro for Web as that's the only supported way to build an Expo Web app in SDK 50.

💚 How did you test it?

build locally

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• All tests passing
• No breaking changes

#skip-changelog

[krystofwoldrich]

• The build error -> node 20 required will be resolved after -> chore(sample): Bump repository to React Native 0.73 #3346

[lucas-zimerman]

LGTM!

[github-actions]

Android (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	403.22 ms	417.94 ms	14.71 ms
Size	17.73 MiB	19.84 MiB	2.11 MiB

Baseline results on branch: expo

Startup times

Revision	Plain	With Sentry	Diff
bc4097b	419.25 ms	458.81 ms	39.56 ms

App size

Revision	Plain	With Sentry	Diff
bc4097b	17.73 MiB	19.84 MiB	2.11 MiB