Allow to exclude certain data storages from the billing reports

[sidoruka]

Background
At the moment, Cloud Pipeline includes any data storage into the billing reports. But we have a number of storage types which are either duplicates or managed by external cloud account:

• Buckets, which are "mirrors" of the existing storages (i.e. those which are used for the data sharing). They are already excluded from the search results, but might be included into billing reports. Please verify
• Data storages, which are "attached" from the external parties. These shall be excluded from the billing, while keeping in the search results.

Approach
Let's introduce a billing tag with possible values:

• include - same as a current behavior, include into billing reports
• exclude - do not process such storage in the billing agent at all
• If a tag is not set - a storage shall be included

[sidoruka]

Shall be backported to release/0.16

[maryvictol]

Test case was created by #3398 and located here.