Add file:// to allowed allowedUrlSchemes of the URL field formatter

[kertal]

Describe the feature:
By adding file:// to the allowed URL schemes, the URL link formatter would allow to generate links to local files

kibana/src/plugins/field_formats/common/converters/url.ts

Line 23 in d6badd8

const allowedUrlSchemes = ['http://', 'https://'];

Describe a specific use case for the feature:
Here's a discuss entry with a user asking for it
https://discuss.elastic.co/t/link-to-local-document-in-kibana-discover/284212

also mailto: and tel: could be added for users indexing their address books :)

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[kertal]

duplicate of #16983, closing

[MaroueneDakhlaoui]

@kertal, adding file:// to the allowed URL schemes doesn't change anything, URL dispatcher is still adding /apps to the URL..

[kertal]

so you tried it out locally, and id didn't work, right?

[MaroueneDakhlaoui]

Yes!

[Leventi]

Adding 'file://' to url.js does not work
const allowedUrlSchemes = ['http://', 'https://', 'file://'];
kibana-8.3.0