fix(v37/backport): fix example deployment by removing gateway object reference

[ws4charlie]

Description

This PR backport 4414

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-v37-remove-gateway-reference-from-sui-example

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.40%. Comparing base (a970a90) to head (21c495c).

Additional details and impacted files

@@                    Coverage Diff                     @@
##           release/zetaclient/v37    #4413      +/-   ##
==========================================================
- Coverage                   66.41%   66.40%   -0.01%     
==========================================================
  Files                         466      466              
  Lines                       27662    27652      -10     
==========================================================
- Hits                        18371    18363       -8     
+ Misses                       8280     8279       -1     
+ Partials                     1011     1010       -1     

Files with missing lines	Coverage Δ
zetaclient/chains/sui/signer/withdraw_and_call.go	81.17% <100.00%> (+0.04%)	⬆️

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