The hoursBetweenBackups of CosmosDB Cassandra Cluster is deprecated

Previously we can set the “hoursBetweenBackups” property successfully and service API would return the corresponding value for this property. But recently though service API accepts “hoursBetweenBackups” while creating/updating but service API wouldn’t return this property anymore. Then I checked with service team and they replied "_To improve our backup service, we have introduced a new property called "backupSchedules" that allows you to define cronExpression ( when to start backups) and retentionInHours (how long to keep them). As a result, the previous parameter "hoursBetweenBackups" has been deprecated._" (Note: Currently "backupSchedules" isn't in azure rest api spec and service team will release it to azure rest api spec in near future.). So I filed this issue for tracking.

Start by checking the Azure REST API specification for the CosmosDB Cassandra Cluster backup properties and the service team's forthcoming backupSchedules definition. The work is done when hoursBetweenBackups is represented as deprecated and backupSchedules, including cronExpression and retentionInHours, is included once available in the REST API spec.

Written by the indexing model from the issue text.