fix: clear awaiting confirmation notifications

[iamacook]

What it solves

Resolves #2581

How this PR fixes it

• The txIds of notified awaiting transactions are now cached and referenced.
• The messageHashes of notified awaiting messages are now cached and referenced.

How to test it

1. Ensure a Safe with 1+/n is open.
2. Queue a transaction with owner A.
3. Switch to owner B.
4. Observe the awaiting confirmation notification.
5. Clear all notifications via the centre.
6. Observe no repeat notification.

Repeat the above, but for off-chain messages.

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) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://clear_awaiting_notifications--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]

Looks good to me

Checked that notifications from pending tx and pending message signing can be dismissed without them showing again.
Checked that the notification pop ups again for new tx or messages.