Fix: ignore nonce for risk scanning requests

[katspaugh]

What it solves

Tx nonce is updated in real-time when creating a new transaction. At first it takes the Safe nonce, then a recommended nonce is fetched and the safeTx object is updated with that.

This triggers two risk scanning requests where the only difference is the nonce.

How this PR fixes it

Since the risk API doesn't seem to care about nonces, I made it always send 0, as well as memoizing the payload as JSON.

How to test it

On prod (so without this fix):

• Go to Swaps
• Create a swap of any two tokens
• Open the console and filter Network Requests by risk
• Confirm the swap to see the Safe Tx confirmation modal
• Observe two /messages requests

On this branch:

• Only one /messages request

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Branch preview

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ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: :white_check_mark: success
  • Annotations: 0 total

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^{Report generated by eslint-plus-action}

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📦 Next.js Bundle Analysis for safe-wallet-web

This analysis was generated by the Next.js Bundle Analysis action. 🤖

🎉 Global Bundle Size Decreased

Page	Size (compressed)
global	1003.75 KB (-2 B)

Details

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Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	79.16% (+0.01% 🔼)	11559/14602
🔴	Branches	58.32% (+0.02% 🔼)	2792/4787
🟡	Functions	66.13% (+0.01% 🔼)	1851/2799
🟢	Lines	80.48% (+0.01% 🔼)	10419/12946

Test suite run success

1444 tests passing in 199 suites.

Report generated by 🧪jest coverage report action from 8897eb370b01fcc93ed25f79a8d9166bb0122286

[liliya-soroka]

Verified. The regression run is also passed. one failed case related to the tooltip for remove owner can be ignored ( not related to the fix)