feat: Adding context to get current confirmation PR-2

[jpuri]

Description

Using context to get currently selected confirmation in re-designed confirmation pages. This is done to switch to using react context transient UI state in re-designed confirmation pages.

Related issues

Ref: https://github.com/MetaMask/metamask-extension/issues/26414

Manual testing steps

NA

Screenshots/Recordings

NA

Pre-merge author checklist

• [X] I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• [X] I've completed the PR template to the best of my ability
• [X] I’ve included tests if applicable
• [ ] I’ve documented my code using JSDoc format if applicable
• [X] 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.