chore: centralize redesigned confirmation decision logic

[cryptotavares]

Description

Related issues

Fixes:

Manual testing steps

1. Go to this page...

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: app/scripts/lib/createRPCMethodTrackingMiddleware.js

Function	Unhandled Issue
finalizeSignatureFragment	Error: Event fragment with id signature-911707255 does not exist. /sc... Event Count: 1 Affected Users: 0

📄 File: app/scripts/lib/transaction/metrics.ts (Click to Expand)

Function	Unhandled Issue
buildEventFragmentProperties	TypeError: null has no properties /background.html Event Count: 20 Affected Users: 0
buildEventFragmentProperties	SyntaxError: Invalid or unexpected token /scripts... Event Count: 7 Affected Users: 0
buildEventFragmentProperties	TypeError: Cannot destructure property 'name' of '(intermediate value)' as it is null. ... Event Count: 5 Affected Users: 0
buildEventFragmentProperties	TypeError: e.ￇ槌ￔ榫ￅ槝iceModel is not a function /sc... Event Count: 4 Affected Users: 0

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