Lately, the health of the Cincinnati CI has been not good. Let's fix that.

• The cargo-test job is passing even though its tests fail on compilation errors
• e2e job is permanently failing; fixed as of https://github.com/openshift/cincinnati/pull/935
• Flaky customrust-e2e job 
• There may be more unknown issues

Definition of Done:

• cargo-test script is fixed
• cargo-test job is passing with the fixed cargo-test script OTA-1348 was created for this effort 
  • if the fixed script is to find significantly more issues (failing tests or compilation errors that need significantly more time to fix), create new cards adequately or increase the story points
• the base image of the e2e test is migrated to ubi9 OTA-1351 was created for this effort 
  • the failing e2e job was fixed with https://github.com/openshift/cincinnati/pull/935; however, the underlying issue was the inevitable migration to ubi9; we might as well migrate to using ubi9 base images right now to ensure no problems in the future
• investigate the somewhat flaky customrust-e2e job
• other tests are verified to be working