Fix fetch of roles when user is not an admin

• Need to know roles of user connected to cf for permissions model
• for non-admins we go out to each type of role and fetch them for current user
  • do we do this instead of fetching individual user for maxed reasons?
• the roles results are 'flattened' (all pages fetched)

Issues

• at some point during v3 these now no-longer respect the 'maxed' list concept. this would be fixed by the updating to new flattener (see below)
• the code to flatten should be replaced with the generic pipeline flatten, see
  • (old, current) src/frontend/packages/store/src/helpers/paginated-request-helpers.ts
  • (new) src/frontend/packages/store/src/entity-request-pipeline/pagination-request-base-handlers/pagination-iterator.pipe.ts

Start with src/frontend/packages/store/src/helpers/paginated-request-helpers.ts and compare it with src/frontend/packages/store/src/entity-request-pipeline/pagination-request-base-handlers/pagination-iterator.pipe.ts. Trace the non-admin role-fetch path and how its flattened results are consumed. Done means the generic pipeline flattener is used and the role requests respect the maxed list concept.