[Monitoring] Define and use internal log source

[weltenwort]

Summary

This defines an internal log source in the infra plugin. The internal log source is used via the link to the Logs UI in the Elasticsearch node detail page of the Monitoring UI.

This should be the missing piece that remained after #31275.

Relates to #31657.

Checklist

• This was checked for cross-browser compatibility, including a check against IE11
• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for keyboard-only and screenreader accessibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately
• This includes a feature addition or change that requires a release note and was labeled appropriately

[elasticmachine]

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[weltenwort]

@elastic/stack-monitoring would you be interested in taking over this PR? I created it as a demonstration of how to use the api introduced in #36066.

[cachedout]

@chrisronline Could you take a look at the request from @weltenwort above?

[chrisronline]

@cachedout @weltenwort

Absolutely. Thanks for putting this together!

[jasonrhodes]

@chrisronline @elastic/stack-monitoring I'm going to remove the logs UI label and leave the version labels for you all to handle how you like. Just a heads up 👍

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[weltenwort]

@cachedout since you expressed interest in more stack-monitoring/logs-ui integration today, let me bring this to your attention again 😉 feel free to close it if you don't think you'll make use of it

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[cachedout]

@igoristic This is an issue you should probably be aware of now that you've taken over some of the logging projects for the team. Let me or @weltenwort know if you have questions about the history here.

[chrisronline]

We already implemented this in another PR, closing