feat: Enable BSC for smart transactions

[dan437]

Description

Enables BSC for smart transactions and reduces status check time to 1s.

We can turn off BSC support for smart transactions remotely if needed.

Related issues

Fixes:

Manual testing steps

1. Make sure smart transactions are enabled in Advanced Settings
2. Be on the BNB Chain
3. Submit a tx. It will be submitted as a smart transaction

Happy paths tested for Swaps, Send and dapp transactions, but this will require extensive testing before it goes to production.

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 [f44d86c]

• 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, 13
  • content-script: 0
  • offscreen: 0

Page Load Metrics (1794 ± 78 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	306	2088	1709	356	171
		domContentLoaded	1546	2033	1760	147	70
		load	1551	2089	1794	162	78
		domInteractive	25	74	45	16	8
		backgroundConnect	6	80	29	26	12
		firstReactRender	16	103	55	31	15
		getState	4	70	19	21	10
		initialActions	0	1	0	0	0
		loadScripts	1086	1541	1308	123	59
		setupStore	6	90	18	23	11
		uiStartup	1756	2741	2116	303	145

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

• background: 0 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 32 Bytes (0.00%)

[metamaskbot]

Builds ready [89c7b31]

• 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, 13
  • content-script: 0
  • offscreen: 0

Page Load Metrics (1748 ± 65 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	251	2001	1458	586	281
		domContentLoaded	1538	1936	1718	132	63
		load	1549	1999	1748	135	65
		domInteractive	19	80	38	15	7
		backgroundConnect	5	66	28	21	10
		firstReactRender	17	101	60	32	15
		getState	5	91	29	31	15
		initialActions	0	1	0	0	0
		loadScripts	1083	1464	1268	120	58
		setupStore	6	65	15	17	8
		uiStartup	1745	2694	2139	286	137

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

• background: 0 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 32 Bytes (0.00%)