NT-2162: Remove comments feature flags

[Arkariang]

📲 What

• Remove all the feature flags related to comments from the source code
• Remove all deprecated code related to the old comments screen
• Remove all the deprecated code related to comments and the V1 API client

👀 See

• No user facing changes
  | | |

📋 QA

• Test you can see root comments
• Test you can see thread comments
• Test you can see the reply button and view replies button only on the root comments screen.
• Test same scenarios as before in updates

Story 📖

NT-2162

[codecov]

Codecov Report

Merging #1367 (33bad71) into master (141f94e) will decrease coverage by 0.53%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1367      +/-   ##
============================================
- Coverage     74.16%   73.63%   -0.54%     
+ Complexity      743      733      -10     
============================================
  Files           221      213       -8     
  Lines          6669     6428     -241     
  Branches        409      400       -9     
============================================
- Hits           4946     4733     -213     
+ Misses         1584     1556      -28     
  Partials        139      139              

Impacted Files	Coverage Δ
...com/kickstarter/ui/adapters/data/CommentsData.java	0.00% <ø> (-100.00%)	⬇️
...va/com/kickstarter/viewmodels/UpdateViewModel.java	95.34% <ø> (-0.36%)	⬇️
...c/main/java/com/kickstarter/libs/ApiPaginator.java	77.01% <0.00%> (-3.45%)	⬇️

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[hadia]

🎉