[Perf] Lazy load site banner

[esizer]

🤖 Resolves #10897

👋 Introduction

Updates the site banner to be dynamically imported so it does not need to load when there is no message to be displayed.

🕵️ Details

Since the banner contains rich text, we need to load tiptap to render the data. Tiptap is one of our larger libraries (307kb) so we should only load it when we need it.

🧪 Testing

1. Build pnpm run dev:fresh
2. Navigate to the homepage
3. Confirm tip tap is not loaded
4. Enable the banner
5. Navigate home
6. Confirm tiptap is loaded and banner renders

📸 Screenshot

Not loaded

Loaded

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 38.69%. Comparing base (44cc729) to head (3ba4ed6).
Report is 1 commits behind head on main.

Files	Patch %	Lines
apps/web/src/components/Layout/BannerContent.tsx	0.00%	4 Missing ⚠️
apps/web/src/components/Layout/SitewideBanner.tsx	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #10899      +/-   ##
============================================
- Coverage     38.70%   38.69%   -0.01%     
  Complexity     1656     1656              
============================================
  Files          1013     1014       +1     
  Lines         30923    30928       +5     
  Branches       6429     6431       +2     
============================================
  Hits          11968    11968              
- Misses        18921    18924       +3     
- Partials         34       36       +2     

Flag	Coverage Δ
integrationtests	68.17% <ø> (ø)
unittests	31.49% <0.00%> (-0.01%)	⬇️

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[petertgiles]

Cool, clean, clever! 🥇