[MBL-1020] Block Users Feature Flag

[scottkicks]

📲 What

A new Feature Flag for the blocking users.

🤔 Why

See engineering plan for more details

🛠 How

• Updated RemoteConfigFeatures, RemoteConfigFeature+Helpers, RemoteConfigFeatureFlagToolsViewModel.
• Added tests

block_users was also added to our Firebase RemoteConfig Dashboard Production, Beta and Alpha apps.

👀 See

✅ Acceptance criteria

• Feature flag is available for use via the featureBlockUsersEnabled() helper method.
• Feature flag is available in our Firebase RemoteConfig Dashboard
• Updating the flag from our Firebase dashboard updates the app
• We can update the app locally. This change persists and takes priority over the Firebase dashboard flag value. This is for internal testing.

[codecov]

Codecov Report

Merging #1870 (887b6c8) into main (f0bf8e5) will decrease coverage by 0.01%.
The diff coverage is 82.75%.

@@            Coverage Diff             @@
##             main    #1870      +/-   ##
==========================================
- Coverage   83.95%   83.95%   -0.01%     
==========================================
  Files        1222     1222              
  Lines      111055   111082      +27     
  Branches    29506    29522      +16     
==========================================
+ Hits        93241    93263      +22     
- Misses      16801    16805       +4     
- Partials     1013     1014       +1     

Files	Coverage Δ
...oteConfigFeatureFlagToolsViewControllerTests.swift	100.00% <100.00%> (ø)
...emoteConfig/RemoteConfigFeature+HelpersTests.swift	100.00% <100.00%> (ø)
...s/RemoteConfigFeatureFlagToolsViewModelTests.swift	100.00% <100.00%> (ø)
...ary/RemoteConfig/RemoteConfigFeature+Helpers.swift	80.00% <80.00%> (ø)
Library/RemoteConfig/RemoteConfigFeature.swift	0.00% <0.00%> (ø)
...Models/RemoteConfigFeatureFlagToolsViewModel.swift	66.29% <62.50%> (-2.85%)	⬇️

... and 1 file with indirect coverage changes

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[amy-at-kickstarter]

LGTM! 👍