feat: add support for Pebble check-failed and check-recovered events

[tonyandrewmeyer]

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Adds explicit support to jhack fire for <container-name>-pebble-check-failed and <container-name>-pebble-check-recovered events.

In very much the same way as notice events prompt asking for the appropriate notice, this will prompt for the appropriate check, if necessary.

OP045

[tonyandrewmeyer]

Works correctly in my local testing. Best to hold off on merging until the Juju & pebble PRs have landed.

[tonyandrewmeyer]

Best to hold off on merging until the Juju & pebble PRs have landed.

Should be good to merge once you're back :smile:.