keycloak update to 18.4.0-bb.1

Big Bang changes

Update test values and documentation for new Keycloak plugin version 3.1.0

Package Merge Request

Only dev environment changes for new plugin version.

Package Changes

https://repo1.dso.mil/big-bang/product/packages/keycloak/-/blob/18.4.0-bb.1/CHANGELOG.md

Package MR

big-bang/product/packages/keycloak!105 (merged)

For Issue

Closes big-bang/product/plugins/keycloak-p1-auth-plugin#20 (closed)