Replaced search for .kytos files with .vue

[HeriLFIU]

Closes #issue_number

Summary

Since we are moving from utilizing the httpvueloader to now using the vue3-sfc-loader, we must now change the napp ui file extension from .kytos to .vue. This is because the vue3-sfc-loader only works on .vue files.

Local Tests

End-to-End Tests

[viniarck]

@HeriLFIU, overall looks the draft looks good, and great the direction it's moving towards, but here a point for you to think about:

• This is a breaking change, can we have sfc loading a custom .kytos as we land these PRs? Since that would make it gradually easier, otherwise we'd also need to land together with the NApps PRs renaming their ui/*.kytos files to ui/*.vue files.

Ultimately, I think it's OK to have officially .kytos to always be .vue in the UI dir, but let's also see if we can temporarily also still support .kytos until we ship the next version, if it's doable and not too much extra unplanned work, can you look into it to see if it's a viable option?

[HeriLFIU]

@viniarck I had tried to search for a method within the documentation but couldn't find anything. I can take another look, try and search for other methods, or maybe we can try and modify SFC directly if the license allows for it.