cdp_datalake_version is incorrectly scoped to Platform in Runtime

[Dan Chaffelson]

cloudera.exe/roles/runtime/tasks/initialize_base.yml

Line 33 in a0ed003

 when: plat__cdp_env_crn is defined 

Should be run_cdp_datalake_version, and therefore settable by the user to override the default and pin the runtime version

[Dan Chaffelson]

Investigation shows this is deliberate as the version is derived from the deployment check in plat and consumed in run