feat: add new default networks

[salimtb]

Description

This PR ensures that a predefined list of popular networks (Arbitrum, BSC, Base, Optimism, and Polygon) is automatically added for new users only during the app startup process. The networks are added using NetworkController.addNetwork within the useEffect hook inside the app's initialization flow.

Related issues

Fixes:

Manual testing steps

1. Install new metamask extension
2. Import/create your wallet
3. check the list of added networks

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 [7225d92]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

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

Page Load Metrics (1891 ± 74 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1679	2403	1891	153	73
		domContentLoaded	1669	2354	1854	142	68
		load	1679	2402	1891	154	74
		domInteractive	21	110	48	20	10
		backgroundConnect	9	123	40	32	15
		firstReactRender	49	212	94	35	17
		getState	4	34	10	8	4
		initialActions	0	1	0	0	0
		loadScripts	1191	1903	1377	140	67
		setupStore	11	81	35	24	12
		uiStartup	1871	2584	2111	185	89

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 0 Bytes (0.00%)
• ui: 1.23 KiB (0.02%)
• common: 84 Bytes (0.00%)

[gambinish]

Pulled and tested, LGTM. Just left a curious comment, but doesn't need to be implemented ✅

[andreahaku]

small comment on better handling of batch promises

[andreahaku]

LGTM