Fix dissemination failure despite satisfying RequiredPeerCount

[drupadh-dinesh]

Type of change

• Bug fix

Description

Previously, private data dissemination created multiple dissemination plans and assigned acknowledgement requirements (MinAck) to specific peers. As a result, dissemination could fail when an acknowledgement was not received from one of the designated peers, even if acknowledgements from other selected peers satisfied the collection's RequiredPeerCount.

This change updates dissemination planning to:

• Select peers across organisations first, then select additional peers up to MaximumPeerCount.
• Aggregate selected peers into a single dissemination plan.
• Validate acknowledgements against the overall RequiredPeerCount instead of requiring acknowledgements from specific peers.
• Prevent dissemination failures when the required number of acknowledgements is received from the selected peer set, regardless of which individual peers respond.

Additional details

Implementation changes include:

• Replacing multiple per-peer dissemination plans with a single dissemination plan containing all selected peers.
• Aggregating peer eligibility using a PKI ID lookup set.
• Selecting additional peers using a partial Fisher-Yates shuffle to avoid duplicate selection and improve efficiency.
• Enforcing MaximumPeerCount during peer selection across organisations.

[drupadh-dinesh]

Hi @pfi79 ,
Could you please review when you have a chance? Thanks!