Add support for running benchmarks in Linux environment.

[kshyju]

resolves #10729

Adding support for running benchmarks on Linux agents. Also, other minor cleanups.

Sample run: https://azfunc.visualstudio.com/internal/_build/results?buildId=200596&view=results

Pull request checklist

IMPORTANT: Currently, changes must be backported to the in-proc branch to be included in Core Tools and non-Flex deployments.

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• [x ] My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

[kshyju]

Build from latest version- https://azfunc.visualstudio.com/internal/_build/results?buildId=200919&view=results