[MOB-9558] refactor AnonymousUserManager after update user changes

[evantk91]

🔹 Jira Ticket(s) if any

• MOB-9558

✏️ Description

This pull request includes some refactoring for better readability after updates to the update user flow.

[codecov]

Codecov Report

Attention: Patch coverage is 59.25926% with 11 lines in your changes missing coverage. Please review.

Please upload report for BASE (feature/itbl-track-anon-user@bf23b00). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...com/iterable/iterableapi/AnonymousUserManager.java	59.25%	5 Missing and 6 partials ⚠️

Additional details and impacted files

@@                       Coverage Diff                       @@
##             feature/itbl-track-anon-user     #791   +/-   ##
===============================================================
  Coverage                                ?   59.30%           
===============================================================
  Files                                   ?       84           
  Lines                                   ?     5849           
  Branches                                ?      752           
===============================================================
  Hits                                    ?     3469           
  Misses                                  ?     2009           
  Partials                                ?      371           

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