add retry logic for deleting files

[YaphetKG]

Issue resolved (if any): #

Description of this pull request:

Retry logic for deleting files. especially useful for NFS based storage systems.

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• I've created tests for all my changes
• My pull request isn't fixing or changing multiple unlinked elements (please create one pull request for each element)
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[ate47]

I suggest you to read that: https://github.com/the-qa-company/qEndpoint/blob/master/.github/CONTRIBUTING.md