[AlesProkop]

Related to #15497

Context

Official build 20261109.6 failed in the early internal-tools restore because NuGet selected the installed Visual Studio MSBuild before the repository bootstrapped its pinned SDK. This narrowly backports the redundant restore-step removal from #14352; the normal eng/CIBuild.cmd -restore path restores internal tooling after SDK bootstrap.

Changes Made

• Removed the early NuGetCommand@2 Restore internal tools step from azure-pipelines/.vsts-dotnet-build-jobs.yml.
• Bumped VersionPrefix from 18.9.23 to 18.9.24 in eng/Versions.props.

Testing

• Parsed azure-pipelines/.vsts-dotnet-build-jobs.yml with PowerShell ConvertFrom-Yaml and verified the removed step is absent and the remaining task order is preserved — passed.
• Parsed eng/Versions.props as XML and verified VersionPrefix is 18.9.24 with no other branding changes — passed.
• Inspected the checked-in restore path from eng/CIBuild.cmd through InitializeToolset, InitializeBuildTool, and InitializeDotNetCli — verified SDK bootstrap remains before toolset restore.
• Ran git diff --check — passed.

Notes

• No manual official, OptProf, or ExpPerf build was queued; automatic PR CI is the first official build validation for this change.

[Copilot]

🟢 Approval recommended

No active review issues are reported for the targeted restore-step removal and servicing-version update.

No open issues 🎉

What changed in this PR

This narrowly backports the redundant internal-tools restore removal from #14352 to vs18.9, avoiding an early restore that could select Visual Studio MSBuild before the repository’s pinned SDK is bootstrapped.

Changes:

• Removes the early NuGetCommand@2 restore step, relying on the normal eng/CIBuild.cmd -restore path.
• Bumps the servicing version from 18.9.23 to 18.9.24.

File	Description
eng/​Versions.props	Updates the servicing version to 18.9.24.
azure-pipelines/​.vsts-dotnet-build-jobs.yml	Removes the redundant pre-bootstrap internal-tools restore step.

_{Review effort: Balanced}