E2E: Make the group used in SAML SSO e2e specs private

Sanad Liaquatrequested to merge
qa-shl-fix-group-saml-specs into master

What does this MR do and why?

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Fixes Group SAML SSO e2e tests. After !118596 (merged) was merged, public groups do not require SSO when not signed in.

Addresses #410421 (closed) and #410426 (closed)

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