Fixing range passed in for ShareFileRange

[ibrahimrabab]

Description

resolves #31524

When ShareFileRange was passed in a range of (startValue, endValue), instead of bytes read returning as the difference of end - start, number of bytes read returned as end value.

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[azure-sdk]

API change check

API changes are not detected in this pull request.

[alzimmermsft]

We should add tests to this to ensure this doesn't break in the future