FFS-2322: Consolidate Pinwheel helpers into PinwheelDataHelper

[tdooner]

Ticket

Resolves FFS-2322.

Changes

FFS-2322: Consolidate Pinwheel helpers into PinwheelDataHelper

This commit does three refactors:

1. Moves all the methods from PaymentsHelper into ReportsHelper (since
   the separation between modules did not really match how we used them)
2. Renames ReportsHelper to PinwheelDataHelper (since the helper was
   used in places unrelated to "reports")
3. Moves the PinwheelDataHelper into "app/helpers" (since it is not an
   ActiveSupport::Concern as is conventional for classes in the
   "app/controllers/concerns" folder)

Context for reviewers

I tested by going through the flow locally with no issues.

Acceptance testing

• No acceptance testing needed
  • This change will not affect the user experience (bugfix, dependency updates, etc.)
• Acceptance testing prior to merge
  • This change can be verified visually via screenshots attached below or by sending a link to a local development environment to the acceptance tester
  • Acceptance testing should be done by design for visual changes, product for behavior/logic changes, or both for changes that impact both.
• Acceptance testing after merge
  • This change is hard to test locally, so we'll test it in the demo environment (deployed automatically after merge.)
  • Make sure to notify the team once this PR is merged so we don't inadvertently deploy the unaccepted change to production. (e.g. :alert: Deploy block! @ffs-eng I just merged PR [#123] and will be doing acceptance testing in demo - please don't deploy until I'm finished!)