Intermittent CI rspec failures with `IronBank::Authentications::Token::InvalidAccessToken`
Problem
Since we've enabled the zuora_rest_api feature flag by default in rspec, we've seen flakiness in some tests with the error IronBank::Authentications::Token::InvalidAccessToken.
Here's an example of the failure: https://gitlab.com/gitlab-org/customers-gitlab-com/-/jobs/420976521
Proposal
The credentials for the Zuora API user are valid so we should investigate what leads to this error. One thing to look at is the session caching in IronBank.
Result
A more stable CI Pipeline.