Revert "Skip .NET SDK first-run experience in Helix work items"

[Youssef1313]

Reverts #66916

Fixes #66925

[Copilot]

Pull request overview

This PR reverts the earlier change that disabled parts of the .NET SDK first-run experience in Helix work items, returning the Helix test runner and scripts to their prior environment-variable configuration (per #66925, once the underlying SDK issue is resolved).

Changes:

• Remove DOTNET_NOLOGO and DOTNET_GENERATE_ASPNET_CERTIFICATE from the HelixTestRunner environment setup.
• Remove the same environment-variable exports/sets from the Helix runtests.sh and runtests.cmd scripts.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
eng/tools/HelixTestRunner/TestRunner.cs	Reverts adding env vars that suppressed the CLI banner and skipped ASP.NET dev cert generation.
eng/helix/content/runtests.sh	Reverts exporting DOTNET_NOLOGO and DOTNET_GENERATE_ASPNET_CERTIFICATE for Helix bash runs.
eng/helix/content/runtests.cmd	Reverts setting DOTNET_NOLOGO and DOTNET_GENERATE_ASPNET_CERTIFICATE for Helix Windows runs.

[Youssef1313]

Let's re-run CI multiple times to see if we see any hangs before merging this.

[Youssef1313]

Helix got green, no hangs, on first attempt.

[Youssef1313]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[wtgodbe]

Thanks!

[Youssef1313]

Helix didn't hang the second run, there is an unrelated flaky test failing:

2026-06-16T18:04:31.2796250Z [xUnit.net 00:00:01.16]     Microsoft.AspNetCore.Components.ComponentsMetricsTest.FailParametersSync_RecordsErrorMetric [FAIL]
2026-06-16T18:04:31.2797790Z [xUnit.net 00:00:01.16]       Assert.True() Failure
2026-06-16T18:04:31.2798210Z [xUnit.net 00:00:01.16]       Expected: True
2026-06-16T18:04:31.2798790Z [xUnit.net 00:00:01.16]       Actual:   False
2026-06-16T18:04:31.2799290Z [xUnit.net 00:00:01.16]       Stack Trace:
2026-06-16T18:04:31.2801960Z [xUnit.net 00:00:01.16]         /_/src/Components/Components/test/ComponentsMetricsTest.cs(221,0): at Microsoft.AspNetCore.Components.ComponentsMetricsTest.FailParametersSync_RecordsErrorMetric()
2026-06-16T18:04:31.2802470Z [xUnit.net 00:00:01.16]            at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
2026-06-16T18:04:31.2803040Z [xUnit.net 00:00:01.16]            at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
2026-06-16T18:04:31.2859390Z   Failed Microsoft.AspNetCore.Components.ComponentsMetricsTest.FailParametersSync_RecordsErrorMetric [< 1 ms]
2026-06-16T18:04:31.2859600Z   Error Message:
2026-06-16T18:04:31.2859620Z    Assert.True() Failure
2026-06-16T18:04:31.2859630Z Expected: True
2026-06-16T18:04:31.2859660Z Actual:   False
2026-06-16T18:04:31.2859670Z   Stack Trace:
2026-06-16T18:04:31.2859730Z      at Microsoft.AspNetCore.Components.ComponentsMetricsTest.FailParametersSync_RecordsErrorMetric() in /_/src/Components/Components/test/ComponentsMetricsTest.cs:line 221
2026-06-16T18:04:31.2859750Z    at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
2026-06-16T18:04:31.2859760Z    at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

[Youssef1313]

I think it should be safe to merge. In case we observed hangs later we can always revisit and revert.