[MOB-7646] update processing logic for diff merge messages

[evantk91]

🔹 Jira Ticket(s) if any

• MOB-7646

✏️ Description

This pull request updates get messages call and the manager logic for diff messages update from the BE.

[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 25 lines in your changes are missing coverage. Please review.

Project coverage is 61.67%. Comparing base (6284d55) to head (db5760a).
Report is 8 commits behind head on master.

❗ Current head db5760a differs from pull request most recent head bfbdac1. Consider uploading reports for the commit bfbdac1 to get more accurate results

Files	Patch %	Lines
...va/com/iterable/iterableapi/IterableApiClient.java	51.85%	10 Missing and 3 partials ⚠️
...ain/java/com/iterable/iterableapi/IterableApi.java	0.00%	8 Missing ⚠️
...om/iterable/iterableapi/IterableEmbeddedManager.kt	84.00%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #714      +/-   ##
==========================================
+ Coverage   61.41%   61.67%   +0.26%     
==========================================
  Files          75       75              
  Lines        4701     4718      +17     
  Branches      535      544       +9     
==========================================
+ Hits         2887     2910      +23     
+ Misses       1511     1503       -8     
- Partials      303      305       +2     

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[Ayyanchira]

Added some comments