fix: [OCISDEV-1045] Show vault-shared mountpoints in the vault drive list

[2403905]

Description

Related PR owncloud/reva#666

Shares of vault resources are mountpoints hosted on the shares storage provider
that grant into the vault storage provider. When listing spaces with the vault
storage_id, the storage registry skipped the shares provider entirely, so the
vault share mountpoint was missing from the vault drive list while still showing
up in the regular drive list.

The registry now also queries the shares provider when the vault storage id is
requested and segregates share mountpoints by their grantStorageID, so a vault
share only appears in the vault drive list and a regular share only in the
regular one.

Related Issue

• Fixes <issue_link>

Motivation and Context

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

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