feat: Update RPC URL check for smart transactions on BNB chain

[dan437]

Description

Updates RPC URL check for smart transactions on BNB chain.

Related issues

Fixes:

Manual testing steps

1. Get the branch and run yarn dist
2. In the /builds folder you will see a .zip file with the extension after its done
3. Install it in Google Chrome
4. When smart transactions are turned on (by default) and you submit a Send or Swap transaction on the BNB chain, it will be submitted as a smart transaction

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 [890ace4]

• 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 (1633 ± 62 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1433	1958	1636	131	63
		domContentLoaded	1424	1940	1610	133	64
		load	1433	1962	1633	130	62
		domInteractive	21	94	37	20	9
		backgroundConnect	10	49	21	12	6
		firstReactRender	15	74	38	25	12
		getState	5	51	14	15	7
		initialActions	0	1	0	0	0
		loadScripts	1009	1505	1179	128	61
		setupStore	6	60	20	20	10
		uiStartup	1658	2580	1891	207	99

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

• background: 0 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 10 Bytes (0.00%)