321-Remove membership references

[jeffplays2005]

Removed membership from Firebase model.

Removed fire store updates in the following endpoints:

• StripeWebhook
  • Removed firestore UserService updates.
  • Updated route testing.
• UserController
  • Changed demote/promote that use UserService.
  • Removed corresponding tests that test for the membership field.
• UserSignup
  • Remove the omitting of membership from the UserSignupRequests interface.
  • Removed setting membership to guest while creating user data.
  • Removed corresponding tests that test for specific membership type.
• PaymentController
  • Update route testing to remove membership types.

Services updated:

• UserDataService
  • Update getFilteredUsers to remove filtering on membership type.
  • Remove corresponding tests based on membership types.
  • Update tests to use the generalised userInfoMocks
  • Removed omitting in EditSelfRequestBody interface.

Mocks updated:

• Removed guest and admin mocks.
• Changed admin mock to a second "general" userInfoMock
  • Changed PricingService to correct mock names.
• Updated and neatened route mocks to reflect the removal of membership.

[github-actions[bot]]

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