Missing pipeline artifacts for internal 8.0 PR builds

[mthalman]

Pipeline artifacts are not being uploaded for internal PR builds of the 8.0 branch. This prevents being able to access binlogs and prebuilt reports of build jobs.

Example build (internal link)

[mthalman]

This is being fixed in https://dev.azure.com/dnceng/internal/_git/dotnet-installer/pullrequest/46876 (internal link).