feat(earn): add pending transaction types

[satish-ravi]

Description

Use the correct pending transaction type for earn txs. Also refactors existing pending tx types to avoid duplication

Test plan

Unit tests, manual

Related issues

• Part of ACT-1182

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 86.33%. Comparing base (a7efc6d) to head (48ac2dd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5434      +/-   ##
==========================================
- Coverage   86.34%   86.33%   -0.01%     
==========================================
  Files         755      755              
  Lines       30942    30942              
  Branches     5281     5281              
==========================================
- Hits        26716    26715       -1     
- Misses       3999     4000       +1     
  Partials      227      227              

Files	Coverage Δ
src/earn/saga.ts	93.93% <ø> (ø)
src/transactions/actions.ts	90.90% <ø> (ø)
src/transactions/types.ts	97.72% <ø> (ø)

... and 1 file with indirect coverage changes

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