feat(config): Parameterize whether or not fiatconnect quotes are supported

[jophish]

Description

Adds a static config parameter to enable/disable fetching FiatConnect quotes.

Test plan

Related issues

• Fixes RET-1145

Backwards compatibility

Yes

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.45%. Comparing base (ef8bf39) to head (28a0460).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5919      +/-   ##
==========================================
- Coverage   88.45%   88.45%   -0.01%     
==========================================
  Files         728      728              
  Lines       30665    30668       +3     
  Branches     5516     5517       +1     
==========================================
+ Hits        27124    27126       +2     
- Misses       3335     3336       +1     
  Partials      206      206              

Files with missing lines	Coverage Δ
src/config.ts	96.29% <100.00%> (+0.03%)	⬆️
src/fiatExchanges/SelectProvider.tsx	90.77% <100.00%> (+0.09%)	⬆️

... and 1 file with indirect coverage changes

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[jeanregisser]

👍