Incidents: Add separate factories for full id tags/partial id tags

[BastianLedererIcinga]

Replace the find factory with 3 separate factories for different use cases.

get(): expects the full id tags of an object and return the matching incident or null
getAll(): expects an iterable that yields arrays if id tags, which are expected to be complete. the created Incidents instance will yield every matching incident.
matchAll(): allows partial matches.

In the case of get() the created Incident is instantiated with a query which is only executed when required.
If the query does not return an incident an IncidentNotFoundException is thrown.

IncidentsTest was adjusted with claude to match the new implementation.

[nilmerg]

Thanks so far. But I feel there's more room for improvement 😉

Looking at how this is used in Icinga DB Web shows that hasIncident and getRoles are now obsolete. That's rather a sign of the reason to only support a single incident, though.

But what Icinga DB Web, as an integration for a single incident, actually does are three things:

1. Showing subscribers and recipients
   a. also checks whether an incident is returned first
2. Showing a quick action to the current user
   a. only if an incident exists
3. Processing said quick action
   a. for a list of incidents, due to bulk actions

There's no reason to fetch the incident in any case, except for the reason to know it exists. But that aside, it is not needed to fetch any incident details at all. And the existence can be verified differently on the use case. Incident::getRole for example, may just throw an error, or return null and none for no role, to indicate a missing incident. Incidents::get must be lazy for this and thus may only be an alias for a factory of Incident.

And this approach I'd like to see also for getAll and matchAll. It must be mandatory to iterate the result to know something matched. hasIncident has really no use in this case and can safely be removed. getRoles may still have a use, but only in case of other integrations, but no known one and thus I'd object it's existence as well.

[nilmerg]

please rebase