feat: Removed multichain flag for v1 release

[NidhiKJha]

This PR is to remove all the Multichain flags from code except the send and swap flow

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/2431

Manual testing steps

1. Run the extension without Multichain flag.
2. All the changes should be there

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask 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.

[salimtb]

@NidhiKJha you have 1 broken unit test

[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.

[sleepytanya]

I'm not sure if 'Select networks for each site' in Experimental settings should be ON by default?
Seems like multichain doesn't work correctly? Sorry, if I'm missing something :).

noFlag.mov

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 67.45%. Comparing base (ed850ee) to head (ef8a63d).

Files	Patch %	Lines
ui/index.js	0.00%	12 Missing ⚠️
ui/components/multichain/app-header/app-header.js	0.00%	1 Missing ⚠️
...i/components/multichain/global-menu/global-menu.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #24362      +/-   ##
===========================================
+ Coverage    67.37%   67.45%   +0.08%     
===========================================
  Files         1286     1286              
  Lines        50114    50077      -37     
  Branches     13004    12985      -19     
===========================================
+ Hits         33761    33777      +16     
+ Misses       16353    16300      -53     

☔ View full report in Codecov by Sentry.
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[metamaskbot]

Builds ready [3f07521]

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

Page Load Metrics (944 ± 636 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	70	183	106	28	14
		domContentLoaded	9	66	23	16	8
		load	56	3389	944	1324	636
		domInteractive	9	66	23	16	8

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

• background: 0 Bytes (0.00%)
• ui: 529 Bytes (0.01%)
• common: 96 Bytes (0.00%)

[metamaskbot]

Builds ready [ef8a63d]

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

Page Load Metrics (659 ± 494 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	70	127	87	16	8
		domContentLoaded	9	44	17	9	4
		load	56	2626	659	1029	494
		domInteractive	9	44	17	9	4

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

• background: 0 Bytes (0.00%)
• ui: 938 Bytes (0.01%)
• common: 96 Bytes (0.00%)

[jpuri]

I reviewed the code owned by confirmations team in the PR, code changes look good to me.