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

[0xadam-brown]

Rebased on an updated target; otherwise unchanged.

[0xadam-brown]

Closing this PR, as my clanker tells me the issue mentioned here will continue indefinitely if this PR is merged, ie, we'll cause the SDK Size Path job to fail perpetually. (Fwiw, I also notice that no files in sentry-java use @file:JvmName.) We can try again if/when we update the R8 rules for the SDK Size Path job.