chore: commit all code from background stuff

[infiniteflower]

Description

This PR contains all of the background related code from #27740. It has been split into its own PR for ease of reviewing. If you would like to test out the functionality of this code, please refer to #27740.

Related issues

Split off from #27740

Manual testing steps

Refer to #27740

Screenshots/Recordings

Refer to #27740

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.