Analytics: add a Confirm transaction event

[katspaugh]

What it solves

In #2787, we added a new event Create transaction. Since a signature is required for both tx creation and confirmation, we cannot use the existing Off-chain signature event to track signatures for existing transactions.
So I've added another event, Confirm transaction to track specifically those kind of signatures.

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Branch preview

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https://fix_sign--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}

[github-actions]

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

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

⚠️ Global Bundle Size Increased

Page	Size (compressed)
global	1.4 MB (🟡 +21 B)

Details

The global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

If you want further insight into what is behind the changes, give @next/bundle-analyzer a try!

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Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.96% (+0% 🔼)	10020/13191
🔴	Branches	50.12%	2040/4070
🔴	Functions	58.76%	1496/2546
🟡	Lines	77.53% (+0% 🔼)	9055/11679

Test suite run success

1098 tests passing in 154 suites.

Report generated by 🧪jest coverage report action from 3a9ccf5

[katspaugh]

Verified: