Refactored the analytics

[kcw-grunt]

📱 Description

This PR refactors the analytics implementation by consolidating event tracking, disabling main activity open events, and adjusting sync analytics thresholds. Firebase analytics collection is now controlled via build variant-specific resource values instead of hardcoded logic. The unlock event constant is simplified to be method-agnostic.

Platform

• Android

🎯 Type of Change

• 🐛 Bug fix
• ✨ New feature
• 🔧 Refactoring (code change that neither fixes a bug nor adds a feature)
• 📚 Documentation update
• 🎨 UI/UX improvement
• ⚡ Performance improvement
• 🧪 Test addition or improvement

Modifications

• app/build.gradle.kts: Added build variant-specific firebase_analytics_collection_enabled resource values (disabled for debug, enabled for release).
• app/src/main/java/com/brainwallet/constants/BWConstants.kt: Removed unused _BW_MAIN_OPEN constant; renamed _20200217_DUWB to _20200217_DU for method-agnostic unlock event tracking.
• app/src/main/java/com/brainwallet/data/repository/SyncAnalyticsRepository.kt: Changed sync completion threshold from totalDuration == 0L to totalDuration <= 8000L to filter out short syncs.
• app/src/main/java/com/brainwallet/ui/BrainwalletActivity.kt: Removed _BW_MAIN_OPEN event logging from onCreate(); updated unlock event constant reference from _20200217_DUWB to _20200217_DU.
• app/src/main/java/com/brainwallet/ui/screens/unlock/components/UnLockScreenBody.kt: Updated unlock event constant reference from _20200217_DUWB to _20200217_DU.
• app/src/test/kotlin/com/brainwallet/consants/BWConstantsTest.kt: Removed _BW_MAIN_OPEN from test validation lists; updated constant references from _20200217_DUWB to _20200217_DU in both test methods.

Removals

• Removed _BW_MAIN_OPEN constant and its logging call from BrainwalletActivity.onCreate() — main activity open events are no longer tracked.

📊 Statistics

• Additions: 8 lines
• Deletions: 12 lines
• Files Changed: 6
• Commits: 1

🎯 Reviewers

@kcw-grunt, @josikie