chore: optimize user engagement event record logic

[zhu-xiaowei]

Description

1. optimize user engagement event record logic.

General Checklist

• Added new tests to cover change, if needed
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

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: 100.00% and no project coverage change.

Comparison is base (77d901f) 100.00% compared to head (d0067c1) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #26   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          986       986           
  Branches       182       182           
=========================================
  Hits           986       986           

Files Changed	Coverage Δ
src/tracker/PageViewTracker.ts	100.00% <100.00%> (ø)

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