feat(cherry-pick): re-enable account syncing (#30464)

[mathieuartu]

Description

This cherry-pick PR re-enables account syncing.
This was disabled in this PR, but shouldn't have been.

Related issues

Fixes:

Manual testing steps

1. Import your SRP
2. Verify that your accounts are downloaded

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.

[metamaskbot]

Builds ready [2a6dece]

• builds: chrome, firefox
• builds (flask): chrome, firefox
• builds (MMI): chrome
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
  • content-script: 0
  • offscreen: 0

Page Load Metrics (1672 ± 73 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	269	1999	1579	321	154
		domContentLoaded	1439	2113	1647	156	75
		load	1487	2120	1672	152	73
		domInteractive	23	94	35	19	9
		backgroundConnect	8	59	29	19	9
		firstReactRender	13	95	38	26	13
		getState	4	58	10	12	6
		initialActions	0	1	0	0	0
		loadScripts	998	1560	1185	131	63
		setupStore	6	66	16	19	9
		uiStartup	1667	2431	1925	187	90

[metamaskbot]

No release label on PR. Adding release label release-12.13.0 on PR, as PR was cherry-picked in branch 12.13.0.