Transfer - Phase 3 progress wrongly adds transferred files

[yahavi]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• All static analysis checks passed.
• This pull request is on the dev branch.
• I used gofmt for formatting the code before submitting the pull request.

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There's an issue that needs fixing:

Steps to reproduce
Execute jf rt transfer-files twice. The second run will show incorrect progress in Phase 3.

The root cause
Phase 3 doesn't retain information, yet it fetches the count of transferred files from the prior run.