## Changes
1. Change the **default-python** bundle template to set
`data_security_mode` of a cluster to SINGLE_USER
2. Change the **experimental-jobs-as-code** bundle template to set
`data_security_mode` of a cluster to SINGLE_USER
## Why
Explicitly adding this field saves experienced users from confusion onto
what security mode is applied to the cluster
## Tests
Changed existing unit and integration tests to pass with this change