[MBL-818] Remove RX1 from message thread holder view/viewmodel

[mtgriego]

📲 What

Update from RX1 -> Rx2 for the message thread holder view/viewholder

🤔 Why

RX1 -> Bad
RX2 -> still not great but better

🛠 How

🧠

📋 QA

Confirm the messages screen still works as expected

Story 📖

MBL-818

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 67.51%. Comparing base (3edb866) to head (3ae5599).

Files	Patch %	Lines
...starter/viewmodels/MessageThreadHolderViewModel.kt	81.25%	3 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2111      +/-   ##
============================================
+ Coverage     67.49%   67.51%   +0.02%     
- Complexity     2131     2133       +2     
============================================
  Files           364      364              
  Lines         22181    22186       +5     
  Branches       3118     3116       -2     
============================================
+ Hits          14971    14979       +8     
+ Misses         5571     5568       -3     
  Partials       1639     1639              

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