nexusRepositoryManager update to 73.0.0-bb.1

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/nexus/-/blob/73.0.0-bb.1/CHANGELOG.md

Package MRs

big-bang/product/packages/nexus!194 (merged)

big-bang/product/packages/nexus!195 (merged)

For Issue

Closes big-bang/product/packages/nexus#148 (closed)

Upgrade Notices

Nexus realms configuration has been moved and is no longer nested under sso. The realm key has been renamed to realms. e.g:

addons:
  nexusRepositoryManager:
    values:
      realms:
        - "DockerToken"