fix: Hide nonce for spending limit txs

[usame-algan]

What it solves

Part of #2067

How this PR fixes it

• Adds an additional field nonceNeeded to the SafeTxContext so the nonce can be hidden from inside flow components
• Closes the flow when submitting a spending limit tx

How to test it

1. Open a Safe with a spending limit
2. Create a new transaction
3. Switch between spending limit and normal transaction
4. Observe the nonce field is disappearing
5. Observe the status widget is changing text
6. Submit the transaction
7. Observe the modal is closing

Screenshots

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

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Branch preview

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https://spending_limit_nonce--walletweb.review-wallet-web.5afe.dev

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ESLint Summary View Full Report

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

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[usame-algan]

Imo its not ideal that we need another flag nonceNeeded in the SafeTxContext now. Ideally we should decide for a given flow if a nonce is needed or not. This is an edge case because we essentially have 2 flows combined (normal transactions and spending limit transactions). Lets revisit the discussion around splitting up the flows for the next iteration cc @katspaugh