audit: Add the count of drives from where the dangling object is removed

[vadmeste]

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Description

Add 'removedFromDrivesCount' to the audit log of a dangling object removal operation.

This means how many drives have been able to successfuly remove the dangling object.

Motivation and Context

How to test this PR?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[shtripat]

lgtm