1. Storing labels in the instance table as well as setting them in the VM in the ignite run command
2. Added migration to add this column with default {"retain":"false"}
3. CI instances/VMs will have {"retain":"false"} label
4. CDE instances/VMs will have {"retain":"false"} label
5. The list instance query from the purger would have {"retain":"false"} matchlabels to match only CI instances and avoid cleanup of CDE instances/VMs

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