fix: Add main frame URL property to req object whenever req is triggered from an iframe

[AugmentedMode]

Description

See the attached issue in metamask planning for more details.

Related issues

Fixes:

Manual testing steps

1. Go to https://develop.d3bkcslj57l47p.amplifyapp.com/
2. Click on Proceed anyways (This phishing warning page here is expected)
3. Open the network tab to monitor network requests
4. Connect your wallet and click on a signature or transaction
5. Verify that mainFrameOrigin is included in the payload of the network request to the security alerts API

Screenshots/Recordings

Below are screenshots demonstrating the behavior of a test HTML page I created:

1. In the first screenshot, before the iframe is loaded, the console shows only the origin of the main frame.
2. In the second screenshot, after clicking the button to load an iframe pointing to example.com, the solution correctly identifies both the mainFrameOrigin (main frame) and the origin (iframe).

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 [e0eacfe]

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

Page Load Metrics (1760 ± 95 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	259	2043	1618	474	228
		domContentLoaded	1448	2024	1726	186	89
		load	1453	2102	1760	198	95
		domInteractive	24	71	39	15	7
		backgroundConnect	8	72	27	20	9
		firstReactRender	16	74	36	21	10
		getState	5	65	21	21	10
		initialActions	0	0	0	0	0
		loadScripts	1016	1529	1271	157	75
		setupStore	6	74	16	18	8
		uiStartup	1680	2421	2023	233	112

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

• background: 742 Bytes (0.01%)
• ui: 0 Bytes (0.00%)
• common: 0 Bytes (0.00%)

[metamaskbot]

Builds ready [e2eb74b]

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

Page Load Metrics (1532 ± 33 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1420	1707	1541	67	32
		domContentLoaded	1405	1689	1515	66	32
		load	1414	1708	1532	68	33
		domInteractive	23	77	37	18	9
		backgroundConnect	7	73	18	15	7
		firstReactRender	16	83	38	25	12
		getState	4	56	22	19	9
		initialActions	0	1	0	0	0
		loadScripts	1018	1293	1116	69	33
		setupStore	6	74	16	20	10
		uiStartup	1575	2197	1803	163	78

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

• background: 716 Bytes (0.01%)
• ui: 0 Bytes (0.00%)
• common: 0 Bytes (0.00%)