devui config should show config source more prominently

[maxandersen]

Description

Just became aware we show the config source in the devui now (yay!), but just when clicking on each config key.

would be great to list which configsources are active and allow to show properties from specific config sources.

Implementation ideas

suggestion from chatting with @phillip-kruger was to replace "show from file properties" checkbox with a dropdown with option to have All, application.properties, Environment, File X, File Y and let user choose one of them and the list will be updated to just show from that config source.

[quarkus-bot]

/cc @cescoffier (devui), @phillip-kruger (devui)