fix: don't close flow in Safe Apps

[iamacook]

What it solves

Resolves #2286

How this PR fixes it

The Safe App transaction flow is no longer closed via the communicator.

How to test it

Observe that the Safe App transaction flow closes in the following instances:

• Queuing a transaction
• Successfully preparing an off-chain signature

Observe that the Safe App transaction flow doesn't close in the following instance:

• Executing a transaction

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) 🧑‍💻

[github-actions]

Branch preview

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

[github-actions]

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}

[francovenica]

LGTM

Adding tx to the queue as just signed but not executed keeps the app open
Creating and executing a tx right away shows the same workflow as executing any other tx.