[PUI] Url fixes

[SchrodingersGat]

• Refactor URL generation functions to use proper URL generators
• Fixes issues with malformed (but still "legal") URLs
• e.g. ApiImage would (prior to this fix) make requests like //media/part/10/attachment.pdf

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Lighthouse	1 paths audited Performance: 99 (🔴 down 1 from production) Accessibility: 86 (no change from production) Best Practices: 100 (no change from production) SEO: 78 (no change from production) PWA: - View the detailed breakdown and full score reports

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[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.

Project coverage is 84.64%. Comparing base (147ca53) to head (f564146).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...rontend/src/components/buttons/PrintingActions.tsx	0.00%	4 Missing ⚠️
...c/frontend/src/components/plugins/PluginSource.tsx	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8615      +/-   ##
==========================================
+ Coverage   84.62%   84.64%   +0.01%     
==========================================
  Files        1189     1189              
  Lines       54285    54284       -1     
  Branches     2054     2052       -2     
==========================================
+ Hits        45940    45949       +9     
+ Misses       7832     7824       -8     
+ Partials      513      511       -2     

Flag	Coverage Δ
pui	69.18% <58.33%> (+0.09%)	⬆️

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