[MBL-823] Update ProjectNotificationViewmodel to RX2

[mtgriego]

📲 What

Updating the viewmodel and relevant view code and tests to Rx2

🤔 Why

RX1 ❌ RX2 ✔️

🛠 How

🧠

📋 QA

Confirm that the views in the notification settings page for individual projects works as expected

Story 📖

MBL-823

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 75.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 67.65%. Comparing base (25bf865) to head (dd7f3d8). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...starter/viewmodels/ProjectNotificationViewModel.kt	75.00%	3 Missing and 2 partials :warning:

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2114      +/-   ##
============================================
+ Coverage     67.51%   67.65%   +0.13%     
- Complexity     2133     2189      +56     
============================================
  Files           364      367       +3     
  Lines         22186    22567     +381     
  Branches       3116     3237     +121     
============================================
+ Hits          14979    15267     +288     
+ Misses         5568     5564       -4     
- Partials       1639     1736      +97     

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