Remove whitelist of receipt keys for canonicalize

[luandy64]

Description of change

This PR changes the tap from canonicalizing 3 fields on the receipt object of transactions to canonicalizing all fields on the the receipt object.

Changes:

• Remove whitelist of receipt keys
• update tests

QA steps

• automated tests passing
• manual qa steps passing (list below)
  • Ran the unittests

Risks

• Low-Moderate:
  • We know of 3 fields that can come back as lower+uppercased, but we and Shopify don't know of all of the possibilities
    • The risk is in the fact that we there could be a receipt field that is and has always been capitalized. This PR would cause that column to split because we would start to canonicalize it

Rollback steps

• revert this branch