[Field Formatters] URL field formatter revamp

[Dosant]

URL field formatter has more enhancement requests than all other formatters combined. This meta issue groups them as this likely better to be looked at a higher level:

Possible shorter term:

• Better Kibana links integration URL field formatter: Better integration with links to Kibana #53763 (can we integrate with drilldowns?)
  • Base path / spaces issues [FieldFormatters] Relative URL formatter inconsistencies with non-empty basePath or custom space #99171
  • Don't trigger page reload Prevent page load in field formatter links #68493
• Integrate external URL allow-serivce [field formatters] url field formatter should obey External URL allow-list service #86058
  • Then extend allowed protocols: file:// URLs get mangled #16983
• Additional variables (can we integrate with URL drilldown context?), can we reuse URL drilldown editor?
  • [Field formatters] Additional variables for URL field formatter #77087
  • Passing time context URL field formatter preserve or have parameters for passing time context #23263

Longer-term:

• Use multiple fields to build the URL? URL formatted to exploit multiple filters #11448
• Preview images/URLs from field formatter Preview thumbnail for URL in Discover #57328

Tech-debt/testing:

• Increase functional test coverage
  • No test in Discover - [Discover] Create functional test for url field formatters #55557
  • Skipped test in Dashboard Failing test: Chrome UI Functional Tests.test/functional/apps/dashboard/url_field_formatter·ts - dashboard app using current data Changing field formatter to Url applied on dashboard #79463

[elasticmachine]

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

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

We are closing this issue in order to provide better transparency of priorities. This issue won't be prioritized in the near future. We track it in #163011 for long term planning.