[ML] Add calendars to cloned jobs

[pheyos]

When cloning ML jobs with calendars directly associated (not via a job group), the cloned job doesn't have the calendars. Job group calendars are present in the cloned job.

Feature request: When cloning jobs, check for non-group calendars of the original job and assign them to the cloned job as well.

[elasticmachine]

Pinging @elastic/ml-ui

[peteharverson]

Closing issue, as when cloning jobs, the non-group calendars of the original job are now correctly assigned to the cloned job. Would have been fixed as part of #51281 for 7.6.0.