chore: add launch counter for Sentry reporting

[mikhail-dcl]

Pull Request Description

has_edentity alone doesn't recognize the first launch, as it will report false on re-login.

What does this PR change?

Adds a LaunchCounter class to the analytics domain that persists and increments a launch count across application runs via DCLPlayerPrefs. The count is attached as a tag to the Sentry loading transaction.

Key Changes

• LaunchCounter static class in Assets/DCL/PerformanceAndDiagnostics/Analytics/ — reads, increments, and persists the count
• DCLPrefKeys.LAUNCH_COUNT key for persistence
• LaunchCounter.Increment() called from AnalyticsContainer.CreateAsync alongside CrashDetector.Initialize
• launch_count tag added to the loading process Sentry transaction in LoadingStatusAnalyticsDecorator
• has_identity and identity_expired tags also included in the same transaction

Test Instructions

Test Steps

1. Launch the application
2. Verify the launch_count tag appears on the loading_process Sentry transaction
3. Close and relaunch — verify the count increments

Quality Checklist

• Changes have been tested locally
• Performance impact has been considered

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	ada4cc4
Logs	https://github.com/decentraland/unity-explorer/actions/runs/23048069239
Download Windows	https://github.com/decentraland/unity-explorer/suites/60480074013/artifacts/5909665497
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/chore/launch_count/pr-19742-ada4cc4/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/60480074013/artifacts/5909534312
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/chore/launch_count/pr-19742-ada4cc4/Decentraland_macos.zip
Built on	2026-03-13T11:50:45Z