fix: remove the engagement time attribute in first screen view

[zhu-xiaowei]

• PR title and description conform to Pull Request guidelines.

Description of changes:

1. remove the negative _engagement_time_msec value in first screen view event

How did you test these changes?
assert the first screen view event does not have the attribute _engagement_time_msec

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

Patch coverage: 66.66% and project coverage change: -0.07% ⚠️

Comparison is base (ba43cfb) 86.52% compared to head (1dfc410) 86.45%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #43      +/-   ##
============================================
- Coverage     86.52%   86.45%   -0.07%     
- Complexity      400      402       +2     
============================================
  Files            39       39              
  Lines          1447     1447              
  Branches        127      128       +1     
============================================
- Hits           1252     1251       -1     
- Misses          122      123       +1     
  Partials         73       73              

Files Changed	Coverage Δ
...tion/clickstream/client/AutoRecordEventClient.java	96.96% <60.00%> (-2.01%)	⬇️
...solution/clickstream/ActivityLifecycleManager.java	97.87% <100.00%> (-0.05%)	⬇️

... and 1 file with indirect coverage changes

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