MBL-896: Added feature flag for new "Use of AI" tab

[Arkariang]

📲 What

• New feature flag

👀 See

• Added feature flags for the 3 project, external, internal and debug

| | |

📋 QA

• Nothig to QA yet.

Story 📖

MBL-896

[codecov]

Codecov Report

Merging #1824 (0f4aeba) into master (a39f7fa) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1824      +/-   ##
============================================
- Coverage     75.11%   75.11%   -0.01%     
+ Complexity     1956     1955       -1     
============================================
  Files           336      336              
  Lines         18352    18353       +1     
  Branches       2442     2442              
============================================
  Hits          13785    13785              
  Misses         3154     3154              
- Partials       1413     1414       +1     

Files Changed	Coverage Δ
.../kickstarter/libs/featureflag/FeatureFlagClient.kt	61.53% <100.00%> (+0.75%)	⬆️

... and 1 file with indirect coverage changes

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