[APM] Allow to create custom links from the Actions drop down in APM

[nehaduggal]

Describe the feature: Currently, the actions dropdown menu in APM is entirely curated and doesn't allow any customization. Adding this new functionality will allow a customer to add additional custom links to other dashboards/tools from APM.

Describe a specific use case for the feature: When debugging a performance issue, a customer would possibly want to navigate to custom created dashboards or tools to be able to do deeper troubleshooting. Our current menu options do not allow for adding custom links into the menu that can help a customer to navigate between custom UIs. With this option, the customer will be able to specify custom URLs in the config file which would then surface on the APM App Actions link and allow for navigation to configured links.

[elasticmachine]

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

[katrin-freihofner]

I think this could work with our new actions menu:

...dependent on #53282

[formgeist]

@katrin-freihofner I think that's a great treatment to the custom links and the "more" option. Do you imagine that clicking "see more" transitions to a new context menu "page" like the current context menu nested functionality?

[katrin-freihofner]

Do you imagine that clicking "see more" transitions to a new context menu "page" like the current context menu nested functionality?

Yes, exactly, I think that could work for many custom links.