Improve deprecation logging UX

[cjcenizal]

This issue is a collection of ideas for improving the deprecation logging UX in Upgrade Assistant, Logs UI, and Discover.

Search and filtering

In a conversation with @bytebilly, we identified potential need for users to filter messages by level (warning, critical). Users might also benefit from being able to search and dismiss individual log messages or categories of log message.

Link generation

In elastic/elasticsearch#79666, @jakelandis suggests dynamically rendering any text beginning with http as a link. Potentially we could also support markdown in deprecation logs (related to #111068), which would give further control to log message authors.

[elasticmachine]

Pinging @elastic/kibana-stack-management (Team:Stack Management)

[sophiec20]

Closing this because it's not planned to be resolved in the foreseeable future. It will be tracked in our Icebox and will be re-opened if our priorities change. Feel free to re-open if you think it should be melted sooner.