fix: engagement time in first screen view when app warm starts

[zhu-xiaowei]

• PR title and description conform to Pull Request guidelines.

Description of changes:

1. fix engagement time in first screen view when app warm starts

How did you test these changes?
added test case to simulation the app warm start and verify _engagement_mesc attribute not in the first screen view event.

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (41ff6e1) 86.45% compared to head (94d44c4) 86.57%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #44      +/-   ##
============================================
+ Coverage     86.45%   86.57%   +0.12%     
- Complexity      402      405       +3     
============================================
  Files            39       39              
  Lines          1447     1453       +6     
  Branches        128      129       +1     
============================================
+ Hits           1251     1258       +7     
  Misses          123      123              
+ Partials         73       72       -1     

Files	Coverage Δ
...solution/clickstream/ActivityLifecycleManager.java	98.03% <100.00%> (+0.16%)	⬆️
...tion/clickstream/client/AutoRecordEventClient.java	97.02% <100.00%> (+0.06%)	⬆️

... and 1 file with indirect coverage changes

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