add/remove/disable vpp token in Fleet UI

[ghernandez345]

relates to #19866

NOTE: API integration work still needs to be done, which will happen in another PR.

This adds the ability to add, remove, or disable a VPP token in the Fleet UI. This includes:

Vpp integration page with VPP card:

VPP setup page with steps to set up VPP:

VPP setup page with VPP info:

Disable VPP modal:

renew Vpp modal:

• [x] Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes. See Changes files for more information.
• [x] Manual QA for all new/changed functionality