Add support for calling automation actions

[t1agob]

Is your feature request related to a problem? Please describe.
The PagerDuty plugin for Backstage is, at this point in time, mostly read-only as it doesn't allow users to perform any action on PagerDuty except from creating incidents.

As Backstage is used as the one stop shop for services I would like to be able to call automation actions from Backstage directly instead of opening to the PagerDuty console and doing it from there.

Describe the solution you'd like
I came up with a basic proposal for what I believe could be the integration of automation actions in Backstage.

In the main incident list we would have a new button that, when clicked, would show the available automation actions available to the user.

Once the automation action was clicked users could check the status of the execution and all previous executions on the Automation Log tab.

Describe alternatives you've considered
At this point in time, the alternative is to open the service page from within the PagerDuty plugin for Backstage and run the automation action from there.