SDK-364 user email on inapp events payload and corresponding tests

[nunolourenco-itrbl]

JIRA Ticket(s) if any

• SDK-364

Description

• Deep dive with findings and fixing

Test Steps

• Checkout the branch and run the auxiliary app for tests

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.45%. Comparing base (ab2e745) to head (b908b26).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #553      +/-   ##
==========================================
- Coverage   74.49%   74.45%   -0.05%     
==========================================
  Files          57       57              
  Lines        2741     2736       -5     
  Branches      820      815       -5     
==========================================
- Hits         2042     2037       -5     
+ Misses        698      658      -40     
- Partials        1       41      +40     

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