Migrate from PCIC to MCIC as single-source of truth

[richard-cox]

• At the moment the single-source of truth for clusters is the provisioning.cattle.io cluster (PCIC)
• This will become the management.cattle.io cluster (MCIC)
  • cluster lifecycle actions will be done via provider specific types (no change)
• Where we list or display information about a cluster it should primarily use the MCIC and should not need the PCIC
• The following needs to be updated
  • Side Nav cluster lists (pinned/not pinned)
    • currently primarily uses MCIC but hides entries that don't have PCIC
    • should be able to drop MCIC now
    • Remove fetch of PCIC from side bar cluster lists #16951 (comment)
      • We can remove references to the provCluster in convertToCluster
  • Home page cluster list
    • currently primarily uses PCIC and should instead use MCIC
    • all data, sorting and filtering should be able to be completed on the MCIC (dont fetch PCIC)
    • we can disable the funky "if more than x clusters show a trimmed down table" feature
    • Convert home and cluster management cluster lists to use MCIC instead of PCIC #17234
  • Cluster Management cluster list
    • currently primarily uses PCIC and should instead use MCIC
    • all data, sorting and filtering should be able to be completed on the MCIC
    • PCIC might need to be fetched to determine actions
    • Convert home and cluster management cluster lists to use MCIC instead of PCIC #17234
  • Cluster Management cluster detail page
    • currently primarily uses both PCIC and MCIC, this probably needs to continue
    • Convert home and cluster management cluster lists to use MCIC instead of PCIC #17234
  • Harvester cluster list
    • currently uses PCIC, but i think this can continue (unless we want to update list to use SSP)
• Follow on items from PRs
  • Convert home and cluster management cluster lists to use MCIC instead of PCIC #17234 (comment)

[richard-cox]

We should also consider removing all the machine / provisioning / machienProvider stuff from models

[richard-cox]

Parts blocked on rancher/rancher#53679