Fetch cshtml from app to render correct app-frontend version in preview

[standeren]

Description

Add endpoint to fetch cshtml file from app-repo and add helper method to modify cshtml to take into account additional route path in the iframe

Related Issue(s)

• #{issue number}

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ea75b66) 87.81% compared to head (711621f) 87.82%.
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12202   +/-   ##
=======================================
  Coverage   87.81%   87.82%           
=======================================
  Files         971      971           
  Lines       13815    13815           
  Branches     1705     1705           
=======================================
+ Hits        12132    12133    +1     
+ Misses       1473     1472    -1     
  Partials      210      210           

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[nkylstad]

Nice! 🥳