Create Multiple Primary MC-Cluster Associations for Topoclusters

[ruse-traveler]

Briefly, what does this PR introduce?

This PR applies the #1396 treatment to the ImagingClusterReco algorithm. As a reminder:

• Previously, the truth in the truth-cluster associations was defined to be the MCParticle of the 1st contribution stored in the list of contributions to the SimCalorimeterHit corresponding to the highest energy hit in the cluster.
• The logic here is
  1. Multiple MC-Cluster associations are created,
  2. Associations link back to primary (generator status == 1) MC particles, and
  3. Each association carries a weight of E_{contributed} / E_{cluster}.

What kind of change does this PR introduce?

• Bug fix (issues Reconstruction: **[Particle Flow]** Validation and enhancement of existing MC-cluster associations #898, Proposal for improved calorimeter cluster associations #1475)
• New feature (issue #__)
• Documentation update
• Other: __

Please check if this PR fulfills the following:

• Tests for the changes have been added
• Documentation has been added / updated
• Changes have been communicated to collaborators

Does this PR introduce breaking changes? What changes might users need to make to their code?

It doesn't introduce breaking changes, but it does substantially alter cluster-MC associations in such a way that users may have account for in downstream analysis code.

Does this PR change default behavior?

Yes: MC-Cluster associations (edm4eic::MCRecoClusterParticleAssociations) will now contain multiple associations per clusters, and will link back to primary (status == 1) MC particles.

[github-actions]

Capybara summary for PR 1631

• rec_dis_10x100_minQ2=0_craterlake
• rec_dis_10x100_minQ2=1000_craterlake_tracking_only
• rec_dis_18x275_minQ2=0_craterlake_18x275
• rec_dis_18x275_minQ2=1000_craterlake_18x275
• rec_dis_5x41_minQ2=0_craterlake_5x41
• rec_e_1GeV_20GeV_craterlake
• rec_pi_1GeV_20GeV_craterlake
  ^{_{Last updated 2024-10-29T15:30-04:00 4d021ac}}

[veprbl]

LGTM