test: UX: Multichain: Add test for mutiple dapp confirmation order

[darkwing]

Description

This PR ensures no dapp-specified transactions get dropped when triggering transactions on dapps, switching to a dapp on another chain, and triggering another transaction.

Related issues

Supercedes: #25459
Fixes:

Manual testing steps

1. Open Tab 1, connect to Uniswap on Ethereum Mainnet
2. Open Tab 2, connect to PancakeSwap on BNB Chain
3. Open Tab 3, connect to Test Dapp on Sepolia
4. Initiate a swap on Tab 1 and Tab 2 BUT DO NOT CONFIRM IT, JUST MOVE ON TO THE NEXT TAB
5. Initiate a send on Tab 3 BUT DO NOT CONFIRM IT
6. On the confirmation screen, you should still see the first confirmation from Tab 1 (Uniswap) on Ethereum Mainnet; confirm or reject it. See the confirmation window close
7. A new confirmation popup should come up with the PancakeSwap/ Tab 2 confirmation on BNB chain; confirm or reject it. See the confirmation window close
8. See one last confirmation screen pop up for the Tab 3 / Test Dapp send on Sepolia. Confirm or reject it.

Screenshots/Recordings

Before

After

Video of equivalent, manual test of this E2E
https://github.com/MetaMask/metamask-extension/assets/46655/cc4578f9-602c-4c2e-835d-79e4ca8ed762

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 [1e5b508]

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

Page Load Metrics (49 ± 5 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	62	100	81	10	5
		domContentLoaded	8	27	12	4	2
		load	37	71	49	10	5
		domInteractive	8	27	12	4	2

Bundle size diffs

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.70%. Comparing base (2a61f59) to head (c438f40).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #25536   +/-   ##
========================================
  Coverage    69.70%   69.70%           
========================================
  Files         1349     1349           
  Lines        47864    47864           
  Branches     13205    13205           
========================================
  Hits         33360    33360           
  Misses       14504    14504           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[metamaskbot]

Builds ready [c438f40]

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

Page Load Metrics (46 ± 4 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	57	96	75	10	5
		domContentLoaded	8	19	11	3	1
		load	37	73	46	9	4
		domInteractive	8	19	11	3	1

Bundle size diffs

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

[chloeYue]

LGTM! Could you add these scenarios on test coverage sheet and fill the version when e2e tests are added so we can track? Thanks !