Update Sonar issues page limit

[drdavella]

Right now we rely on the default page size limit for the Sonar Issues API which is 100. The maximum allowed by the API is 500. We should explicitly use this maximum until we properly handle pagination for Sonar Issues.

See the ps parameter in the Sonar Issues API docs: https://next.sonarqube.com/sonarqube/web_api/api/issues/search