Create keycloak SSO user for SSO testing

Create user in keycloak.bigbang.dev that doesn't require multifactor authentication or generate a new realm config with it disabled so that a cypress test could create a user then login to bigbang packages in CI.

Keycloak MR: https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/61

Second Keycloak MR (for post-install hook): https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/62

Pipeline Templates MR (superceded by 2nd Keycloak MR): https://repo1.dso.mil/platform-one/big-bang/pipeline-templates/pipeline-templates/-/merge_requests/155

Bigbang MR: https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/1499

Notes: The Keycloak documentation is incorrect and states that the request to create a user has only optional keys. Creating a user requires AT LEAST the keys specified in the tnr_XYZ variables.