Webhook event lost when Bugzilla is down

[leplatrem]

According to this code, when we fail at retrieving the bug details and comment, we raise an IgnoreInvalidRequestError.

jira-bugzilla-integration/jbi/runner.py

Lines 222 to 228 in 5a14f89

	except Exception as err:
	logger.exception(
	"Failed to get bug: %s", err, extra=runner_context.model_dump()
	)
	raise IgnoreInvalidRequestError(
	"bug not accessible or bugzilla down"
	) from err

We could be a little bit more precise here, and only ignore the event when the HTTPError exception on GET is a 4XX. And add the event in the queue otherwise