Remove the workaround to explicitly set the container runtime for tests now that the orchestrator is updated

[danegsta]

A recent orchestrator update changed how we autodetect container runtimes, so the workaround of forcing the runtime should no longer be necessary.

[Copilot]

Pull Request Overview

This PR removes an outdated workaround for explicitly setting the container runtime in test environments, as the orchestrator update now supports autodetection.

• Removed the forced container runtime command from the Helix test project.
• Removed the environment variable overrides from the BuildAndTest pipeline and GitHub workflows.

Reviewed Changes

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

File	Description
tests/helix/send-to-helix-inner.proj	Removed the explicit container runtime setting and its comment
eng/pipelines/templates/BuildAndTest.yml	Removed the container runtime environment variable override
.github/workflows/run-tests.yml	Removed the container runtime environment variable override from multiple job definitions

Comments suppressed due to low confidence (4)

tests/helix/send-to-helix-inner.proj:155

• Removal of the explicit container runtime setting is correct given the orchestrator update. Please verify that tests in environments relying on autodetection behave as expected.

<!-- Force container runtime to Docker since that's what is installed on Helix -->

eng/pipelines/templates/BuildAndTest.yml:108

• The removal of the forced container runtime in the pipeline environment variables is aligned with the updated orchestrator behavior. Consider confirming that the build and test scripts work correctly across all supported platforms.

DOTNET_ASPIRE_CONTAINER_RUNTIME: docker

.github/workflows/run-tests.yml:215

• Consistent removal of the container runtime override from the workflow is appropriate with the orchestrator update. Ensure that the workflow tests remain stable without this variable.

DOTNET_ASPIRE_CONTAINER_RUNTIME: docker

.github/workflows/run-tests.yml:237

• The removal of the runtime override in this job is consistent with the intended changes. Confirm that no dependency on the explicit variable exists in any downstream steps.

DOTNET_ASPIRE_CONTAINER_RUNTIME: docker