feat(earn): fetch token balances after a tx is submitted

[satish-ravi]

Description

Should help with https://valora-app.slack.com/archives/C04B61SJ6DS/p1716315055922759?thread_ts=1716314300.065339&cid=C04B61SJ6DS

Test plan

Unit tests

Related issues

• N/A

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 86.33%. Comparing base (a36105f) to head (4abc30a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5448      +/-   ##
==========================================
- Coverage   86.34%   86.33%   -0.01%     
==========================================
  Files         756      756              
  Lines       31233    31236       +3     
  Branches     5364     5364              
==========================================
  Hits        26967    26967              
- Misses       4033     4036       +3     
  Partials      233      233              

Files	Coverage Δ
src/earn/saga.ts	94.93% <100.00%> (+0.09%)	⬆️

... and 1 file with indirect coverage changes

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