[CAPELLA] Scaling failed due to FTS rebalance being stuck on 7.2.1-5904

During a QE validation run for a new AMI for Capella for 7.2.1 a scaling job failed due to what appears to be a FTS rebalance being "stuck".

Logs:

https://cb-engineering.s3.amazonaws.com/aman/collectinfo-2023-08-08T081521-ns_1%40svc-dqisea-node-001.fkarrdchs-9uda2e.sandbox.nonprod-project-avengers.com.zip

https://cb-engineering.s3.amazonaws.com/aman/collectinfo-2023-08-08T081521-ns_1%40svc-dqisea-node-002.fkarrdchs-9uda2e.sandbox.nonprod-project-avengers.com.zip

https://cb-engineering.s3.amazonaws.com/aman/collectinfo-2023-08-08T081521-ns_1%40svc-dqisea-node-003.fkarrdchs-9uda2e.sandbox.nonprod-project-avengers.com.zip

https://cb-engineering.s3.amazonaws.com/aman/collectinfo-2023-08-08T081521-ns_1%40svc-dqisea-node-004.fkarrdchs-9uda2e.sandbox.nonprod-project-avengers.com.zip

More details can be found on the AV ticket - https://couchbasecloud.atlassian.net/browse/AV-59797.