Stabilize group saml SSO e2e tests

What does this MR do?

Makes an attempt to fix Group SAML SSO related failures reported in #55242 (closed)

The issue mainly is that group managed accounts do not get enabled sometimes. This MR ensures that this setting is enabled by using retries.

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content