feat(earn): get gas padding from dynamic config

[satish-ravi]

Description

As the title

Test plan

Unit tests, manual
Successful tx: https://sepolia.arbiscan.io/tx/0xe681a97041ad016ecfae008111285db3b14a60a5054abd5912109af2987245d0
https://arbiscan.io/tx/0x3a72d7edf302f4d88ae86dc42bbffd87b95d47ee9b4a1a0723ddee13cd30954f

earn-submit-successful-deposit.mp4

Related issues

• Part of ACT-1178

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 86.16%. Comparing base (14a2d7e) to head (d079352).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5418      +/-   ##
==========================================
- Coverage   86.17%   86.16%   -0.01%     
==========================================
  Files         748      748              
  Lines       30384    30388       +4     
  Branches     5187     5187              
==========================================
+ Hits        26183    26185       +2     
- Misses       3973     3975       +2     
  Partials      228      228              

Files	Coverage Δ
src/earn/prepareTransactions.ts	97.72% <100.00%> (+0.22%)	⬆️
src/statsig/constants.ts	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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