WHAT

Cleanup mas-sso code from UI

WHY

mas-sso has migrated with redhat-sso. We don't need mas-sso code anymore in UI.

HOW

Remove mas-sso code from keycloak.js and remove additional flag  code from AppEntry.tsx file.

DONE

Include the following where applicable:

• <bulleted list of functional acceptance criteria that need to be completed>
• <call out anything on the documentation side that's needed as a result of this task being completed>
• <any metrics, monitoring dashboards and alerts that need to be created or be updated>
• <SOP creation or updates>

Guidelines

The following steps should be adhered to:

• Required tests should be put in place - unit, integration, manual test cases (if necessary)
• CI and all relevant tests passing
• Changes have been verified by one additional reviewer against:
• each required environment
• each supported upgrade path
• If the changes could have an impact on the clients (either UI or CLI), a JIRA should be created for making the required changes on the client side and acknowledged by one of the client side team members. PR has been merged