[PM-37254] Add fill-assist-targeting-rules feature flag

[aj-rosado]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-37254

📔 Objective

Add fill-assist-targeting-rules feature feature flag

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.02%. Comparing base (cc210a5) to head (14095a8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6952      +/-   ##
==========================================
+ Coverage   86.06%   87.02%   +0.96%     
==========================================
  Files         959      856     -103     
  Lines       65366    62876    -2490     
  Branches     9240     9188      -52     
==========================================
- Hits        56257    54719    -1538     
+ Misses       5935     4998     -937     
+ Partials     3174     3159      -15     

Flag	Coverage Δ
app-data	17.09% <ø> (+0.29%)	⬆️
app-ui-auth-tools	19.15% <ø> (-0.20%)	⬇️
app-ui-platform	16.26% <ø> (-0.53%)	⬇️
app-ui-vault	27.95% <ø> (-0.64%)	⬇️
authenticator	6.29% <ø> (+0.04%)	⬆️
lib-core-network-bridge	4.10% <ø> (+0.01%)	⬆️
lib-data-ui	1.16% <ø> (+<0.01%)	⬆️

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