Add periodic testing latest scylla operator with latest scylla and manager

[tnozicka]

We should test latest operator with latest prerelease of scylladb and manager to discover possible issues early.

Requires:

• [x] https://github.com/scylladb/scylla-operator/issues/1589

  
  ### Tasks

• [ ] allow live adjusting config.yaml
• [ ] configure latest periodic

[scylla-operator-bot[bot]]

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/lifecycle stale

[tnozicka]

/remove-lifecycle stale /triage accepted