Reference navigation for disabled observers

[DmitryFurs]

Is your feature request related to a problem? Please describe.

Version 3.0.0 added reference navigation for disabled plugins. It will be very useful to add the same behavior for observers.

Currently, when we press Ctrl+Click on the observer name, it shows us a notification Cannot find declaration to go to

Describe the solution you'd like (*)

Implement the same behavior for observers as for plugins.

Additional context

#146
#373

[m2-assistant]

Hi @DmitryFurs. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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[drpayyne]

@magento I am working on this