Add deployment freeze override fields

[bec-callow-oct]

[SC-96959]

Adds two new fields to the CreateExecutionAbstractCommandV1:

DeploymentFreezeNames contains a list of a list of names of deployment freezes to override when attempting to start a deployment.

DeploymentFreezeOverrideReason provides a reason for overriding all of the above deployment freezes.

This PR leverages work done in this PR for Octopus Server, where both of the above fields are required if a deployment freeze is active for the specified project and environment.