test(restore): add mock test for restore endpoint

[mittachaitu]

Signed-off-by: mittachaitu sai.chaithanya@mayadata.io
This PR adds a mock test(unit test) for Restore endpoint.

List of unit test
Backup endpoint

• Trigger delete method on the backup endpoint(It should delete snapshot, CStorBackup, and CStorCompletedBackup CR's).
• Trigger delete method on the backup endpoint by injecting errors in snapshot deletion(should return an error).
• Trigger delete method on the backup endpoint when the backup is for scheduled backup(It should not delete CStorCompletedBackup).
• Trigger delete method on the backup endpoint without the required information(should return an error).

Restore endpoint

• Trigger POST method for remote restore on the restore endpoint(It should create required resources for restore).
• Trigger POST method for remote restore on the restore endpoint by disabling the CVC reconciliation(should return an error).
• Trigger POST method for local restore on the restore endpoint(positive and error injection are covered).

[prateekpandey14]

minor comments otherwise looks good

[prateekpandey14]

lgtm