chore(compose): Rename file for SentryTraced

[0xadam-brown]

📜 Description

Renamed SentryComposeTracing.kt -> SentryTraced.kt to match our usual conventions + make it easier to find SentryTraced in the IDE.

Rename keeps binary compatibility with previous file name for Java clients.

💡 Motivation and Context

Having file names match public composable APIs is especially helpful b/c composables are functions, not classes, so most IDEs don't have a type-based global search for them (but do let you search files by name).

💚 How did you test it?

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

#skip-changelog