[K8SPSMDB-894] Add support for partial restores

[spron-in]

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Tell us about the feature

With the release of https://jira.percona.com/browse/PBM-790 it is now possible to backup and restore a subset of collections.

 

We should add similar feature in the Operator.

Following the thread on the forum: https://forums.percona.com/t/exclude-specific-collections-from-the-perconaservermongodbbackup/20936

Link to JIRA