[APM] Check is License Management is enabled when linking to it

[yuliacech]

The APM plugin has a License Prompt component and an Invalid License notification that link to the License Management plugin.

We are adding a config that would allow disabling the License Management plugin, so this link might lead to a Not Found route in Kibana in that case.

[elasticmachine]

Pinging @elastic/platform-deployment-management (Team:Deployment Management)

[elasticmachine]

Pinging @elastic/apm-ui (Team:APM)

[sorenlouv]

We are adding a config that would allow disabling the License Management plugin, so this link might lead to a Not Found route in Kibana in that case.

@yuliacech Didn't we decide a while back to enable all plugins to avoid the complexity optional plugins comes with?

Just to close the loop here for clarity: with these changes, none of the plugins that ship with Kibana will be disable-able starting in 8.0, with the exception of the following:

[yuliacech]

Yes, that is correct @sqren, but for serverless we might want to make some plugins disable-able again but in a very limited combination. So we wanted to document any "hidden"/implicit dependencies on License Management for now.

The problem with the links still needs to be addressed at some point though, because License Management currently can be hidden from UI completely with ui.enabled: false. In that case the link would still lead to a Not Found in Kibana.

I think a recommended way to (deep)link to other plugins would be a URL locator. I will open an issue to add one for License Management that can later be used by the APM plugin.

[gbamparop]

Here's an example of the usage in the watcher plugin.