[backport v2.9.5] Use complete source maps for Vue

[github-actions]

This is a backport issue for #12306, automatically created via GitHub Actions workflow initiated by @richard-cox

Original issue body:

Is your feature request related to a problem? Please describe.

Debugging and especially profiling dashboard production builds is difficult because original function names are not available.

Function names are not available because source maps are incorrect. Source maps are incorrect because Vue function names are taken from the minified version of the library (vue.min.js), where they are already shortened and therefore not easily readable.

Eg.

Describe the solution you'd like

Fully functional source maps, including Vue. Eg.

Describe alternatives you've considered

No alternatives considered.

Additional context

This is expected to be particularly useful to investigate at-scale scenarios.