Update pipeline so that .NET 8 and .NET 6 artifacts are published

[aishwaryabh]

Issue describing the changes in this PR

The 1ES pipeline wasn't building the .NET 6 and .NET 8 artifacts since the minorPrefixVersion was not specified. This PR fixes this step.

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
• 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)

Additional information

Additional PR information

[jviau]

Is someone using the 1ES pipeline for in-proc already? I wasn't worrying about getting this working on in-proc as I have a follow-up PR to #10168 for in-proc