cleanup(sessions): replace promises with swift concurrency

[ncooke3]

Note: This is non-breaking, but planned for Firebase 13.0 to prevent risk of introducing a regression in a final 12.x release.

Summary

Replaces the Promises library dependency in FirebaseSessions with native Swift Concurrency.

Key Changes

• Actor State Management: Replaced FBLPromises subscriber tracking in FirebaseSessions with a new internal SessionsState actor.
• Dependency Removal: Removed Promises from Package.swift and FirebaseSessions.podspec.
• Test Modernization: Updated FirebaseSessions unit test suite and base helpers to use async/await and added SessionsStateTests.

#no-changelog

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