Xload: E2E tests

[souravgupta-msft]

Type of Change

• Bug fix
• New feature
• Code quality improvement
• Other (describe):

Description

Add E2E tests in nightly pipeline for preload.

How Has This Been Tested?

Added a stage in nightly pipeline for validation of xload which

• Uploads random sized data using file cache and computes its md5sum
• Mount using xload and computes its md5sum
• Compares the md5sum of both the approaches

Checklist

• The purpose of this PR is explained in this or a referenced issue.
• Tests are included and/or updated for code changes.
• Documentation update required.
• Updates to module CHANGELOG.md are included.
• License headers are included in each file.