chore: remove unused log file writer v1 [WPB-26807]

[MohamadJaara]

https://wearezeta.atlassian.net/browse/WPB-26807

Summary

• Remove the unused LogFileWriterV1Impl implementation.
• Make LogWriterModule always provide LogFileWriterV2Impl.
• Remove the obsolete use_async_flush_logging BuildConfig flag from configuration generation.

Why

LogFileWriterV2Impl is the active log file writer path, so the V1 fallback and its selector flag are no longer needed. Keeping both paths adds maintenance overhead without any current runtime use.

Validation

• ./gradlew :app:testDevDebugUnitTest

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Reliability Rating on New Code (required ≥ A)

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.43%. Comparing base (5487909) to head (19d667a).

Files with missing lines	Patch %	Lines
...m/wire/android/util/logging/LogFileWriterConfig.kt	0.00%	1 Missing ⚠️
...com/wire/android/util/logging/LogFileWriterImpl.kt	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5024      +/-   ##
===========================================
+ Coverage    49.27%   49.43%   +0.16%     
===========================================
  Files          653      652       -1     
  Lines        23553    23475      -78     
  Branches      3615     3600      -15     
===========================================
  Hits         11606    11606              
+ Misses       10873    10795      -78     
  Partials      1074     1074              

Files with missing lines	Coverage Δ
...m/wire/android/util/logging/LogFileWriterConfig.kt	0.00% <0.00%> (ø)
...com/wire/android/util/logging/LogFileWriterImpl.kt	0.00% <0.00%> (ø)

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