chore(config): move more remote config to Statsig

[kathaypacific]

Description

This PR moves the following remote config variables to statsig dynamic config:

• dapp list url -> app config
• dapp in-app webview enabled -> dapps webview config
• celo news -> app config
• swap price impact warning threshold -> swap config
• maxNumRecentDapps is no longer used and just removed here

Test plan

n/a

Related issues

• Related to RET-1272

Backwards compatibility

Y

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 89.04%. Comparing base (60519ee) to head (5ec4712).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6474      +/-   ##
==========================================
+ Coverage   89.02%   89.04%   +0.02%     
==========================================
  Files         729      729              
  Lines       31871    31858      -13     
  Branches     5819     6138     +319     
==========================================
- Hits        28373    28369       -4     
+ Misses       3450     3441       -9     
  Partials       48       48              

Files with missing lines	Coverage Δ
src/app/reducers.ts	26.82% <ø> (ø)
src/app/saga.ts	70.61% <ø> (ø)
src/app/selectors.ts	96.42% <ø> (-0.13%)	⬇️
src/celoNews/CeloNewsFeed.tsx	97.22% <100.00%> (+0.07%)	⬆️
src/dapps/saga.ts	83.87% <100.00%> (+0.82%)	⬆️
src/dapps/selectors.ts	100.00% <100.00%> (ø)
src/dapps/slice.ts	23.52% <100.00%> (-2.67%)	⬇️
src/firebase/firebase.ts	41.66% <ø> (+0.64%)	⬆️
src/firebase/remoteConfigValuesDefaults.ts	100.00% <ø> (ø)
src/redux/migrations.ts	97.03% <100.00%> (+<0.01%)	⬆️
... and 7 more

... and 3 files with indirect coverage changes

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[sviderock]

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