Deflake sequential proxy swap GIGA test

[masih]

The Autobahn EVM GIGA integration job intermittently failed with "incorrect account sequence" on tokenA.approve inside a loop that issued approve+swap pairs back-to-back on the shared owner signer.

Approve once up front (matching the other multi-swap test in this file) and wait between swaps so the live docker cluster's account sequence stays aligned with ethers' nonce tracking. This removes the extra per-iteration approve that widened the CheckTx race window without changing what the test exercises (two sequential multi-hop
proxy swaps).

Flaked in unrelated changes.

[cursor]

PR Summary

Low Risk
Low risk since changes are isolated to integration test logic, but the added delay() calls can increase test runtime and may mask genuine sequencing issues if overused.

Overview
Deflakes the sequential proxy swap portions of EVMGigaTest.js by approving tokenA once up-front for the total amount (instead of per-iteration approvals) and inserting a delay() between back-to-back swaps.

This reduces intermittent "incorrect account sequence" failures in environments where nonce/sequence updates can lag when submitting consecutive transactions from the same signer.

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 22, 2026, 1:15 PM

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.13%. Comparing base (cb72147) to head (e8cb3e9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3485      +/-   ##
==========================================
+ Coverage   59.11%   59.13%   +0.01%     
==========================================
  Files        2187     2187              
  Lines      182237   181998     -239     
==========================================
- Hits       107723   107618     -105     
+ Misses      64852    64719     -133     
+ Partials     9662     9661       -1     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)

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[wen-coding]

nit: I think delay() is fine, we could also check the sequence number like in #3486

But we can see whether delay just fixes the problem