[MMI] Remove Whats-new-popup mmi code fences

[albertolive]

Explanation

Remove Whats-new-popup mmi code fences. Currently, those code fences are doing nothing, and we don't have any plans yet to add custom mmi popups.

Pre-merge author checklist

• I've clearly explained:
  • What problem this PR is solving
  • How this problem was solved
  • How reviewers can test my changes
• Sufficient automated test coverage has been added

Pre-merge reviewer checklist

• Manual testing (e.g. pull and build branch, run in browser, test code being changed)
• IF this PR fixes a bug in the release milestone, add this PR to the release milestone

If further QA is required (e.g. new feature, complex testing steps, large refactor), add the Extension QA Board label.

In this case, a QA Engineer approval will be be required.

[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.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (b7ad9f6) 68.49% compared to head (11ba515) 68.50%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #21146      +/-   ##
===========================================
+ Coverage    68.49%   68.50%   +0.01%     
===========================================
  Files         1012     1012              
  Lines        40588    40574      -14     
  Branches     10843    10838       -5     
===========================================
- Hits         27799    27792       -7     
+ Misses       12789    12782       -7     

Files	Coverage Δ
.../components/app/whats-new-popup/whats-new-popup.js	40.91% <100.00%> (-1.16%)	⬇️
ui/pages/home/home.component.js	46.83% <100.00%> (+0.23%)	⬆️

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[metamaskbot]

Builds ready [11ba515]

• 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
  • common: 0, 1, 2, 3, 4, 5, 6, 7
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (866 ± 369 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	84	133	100	13	6
		domContentLoaded	71	123	93	15	7
		load	81	1760	866	769	369
		domInteractive	71	123	93	15	7

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: -6 Bytes (-0.00%)
• common: 0 Bytes (0.00%)

[zone-live]

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