Fix flaky EE::API::Entities::MemberRole spec
What does this MR do and why?
- Follows from #447504 (closed)
- In the failed jobs, the error is consistently
Validation failed: Cannot create a member role with no enabled permissions
, which is why I have updated this spec to uselet_it_be
when creating a member role and to explicitly create the role with theread_code
permission. - However, unable to reproduce the flakiness locally, even with a randomised seed.
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Related to #447504 (closed)