refactor: Extract code that creates window.Vaadin.views json

[Artur-]

For #2751

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.48%. Comparing base (a897599) to head (2d99432).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2755   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          81       81           
  Lines        2648     2648           
  Branches      666      666           
=======================================
  Hits         2502     2502           
  Misses        142      142           
  Partials        4        4           

Flag	Coverage Δ
unittests	94.48% <ø> (ø)

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[taefi]

LGTM