ErrorQueueDispatchingStrategy ends up using an incorrect QueueProvider

Currently, ErrorQueueDispatchingStrategy [0] interface dictates that the .add [1] method supplies the DistributionQueueProvider [1] to it.

For ForwardDistributionAgentFactory (and perhaps other Agent-factories as well), this DistributionQueueProvider is further used to .getQueue by a name [2].

As the discussion in SLING-8854 concluded, it was found acceptable [3] for DistributionQueue impls and DistributionQueueProvider impls to share state - concordantly, there needs to be a way for Agent-Factories to dictate which specific queue-providers they want ErrorQueueDispatchingStrategy to use.

One approach to make that happen would be to enhance ErrorQueueDispatchingStrategy with another CTOR to accept a DistributionQueueProvider argument. The impl of .add can then treat the supplied DistributionQueueProvider at the time of API invocation as a 'hint' and ignore it if the ErrorQueueDispatchingStrategy already has one of its own.

[0] https://github.com/apache/sling-org-apache-sling-distribution-core/blob/master/src/main/java/org/apache/sling/distribution/queue/impl/ErrorQueueDispatchingStrategy.java
[1] https://github.com/apache/sling-org-apache-sling-distribution-core/blob/537bb57af821f21537cf4a24ad7d2347c6a5dae1/src/main/java/org/apache/sling/distribution/queue/impl/ErrorQueueDispatchingStrategy.java#L56
[2] https://github.com/apache/sling-org-apache-sling-distribution-core/blob/537bb57af821f21537cf4a24ad7d2347c6a5dae1/src/main/java/org/apache/sling/distribution/agent/impl/SimpleDistributionAgentQueueProcessor.java#L187
[3] https://issues.apache.org/jira/browse/SLING-8854?focusedCommentId=16982396&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16982396