Use protoclusters for track cluster merger

[ruse-traveler]

Briefly, what does this PR introduce?

This PR converts the proposed track-based cluster merger algorithm to operate on protoclusters and produce protoclusters rather than reconstructed clusters.

What kind of change does this PR introduce?

• [ ] Bug fix (issue #__)
• [ ] New feature (issue #__)
• [ ] Documentation update
• [X] Other: implement changes to a feature branch

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?

n/a

Does this PR change default behavior?

n/a

[github-actions[bot]]

Capybara summary for PR 1468

• rec_dis_10x100_minQ2=0_craterlake
• rec_dis_10x100_minQ2=1000_craterlake
• rec_dis_18x275_minQ2=0_craterlake
• rec_dis_18x275_minQ2=1000_craterlake
• rec_dis_5x41_minQ2=0_craterlake
• rec_e_1GeV_20GeV_craterlake
• rec_pi_1GeV_20GeV_craterlake ^{_{Last updated 2024-05-26T13:52-04:00 97e0f27a8189379182598c1a3c9145ee49c3f852}}