I understand you are looking to understand how often Atlassian is performing security testing against Jira Cloud. There is more info in regards in Our Approach to External Security Testing. From that page:
Our external security testing approach is built around the concept of 'continuous assurance' – rather than a point-in-time penetration test, we have an always-on, always-testing model using a crowd-sourced bug bounty.
So while we don't have an "x number of tests over y period of time"-type answer here, the answer is that Atlassian is continuously seeking out ways to discover vulnerabilities in our own products. We would much rather learn of these from our bugbounty program than to find them in the wild.
There is also more information about our approach in https://www.atlassian.com/trust/security/security-practices#product-security-testing.
I hope this helps.
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