Update stale VSTEST_HOST_DEBUG env var on non debug test run

[rowanhwilliams]

Problem

Test runs triggered via the Ionide Test Adapter hang and never complete, when run after a test has been debugged via the Test Adapter.

Caused by stale VSTEST_HOST_DEBUG=1 env variable values affecting the non-debug run, resulting in the test hanging waiting for debugger attachment.

Steps to reproduce

1. Create solution and open solution:

mkdir HangingTestExecutionTestCase && cd HangingTestExecutionTestCase
dotnet new sln -n HangingTestExecutionTestCase
dotnet new console -lang "F#" -o console
dotnet sln add console/console.fsproj
dotnet new xunit -lang "F#" -o tests
dotnet sln add tests/tests.fsproj
code .

2. Click on Testing in Primary Side Bar, wait for Ionide F# Test Explorer to load
3. Open tests tree and click debug icon on the My test F# test - test is executed with debugger attached
4. Click run icon on the My test F# test (no debug run) - test execution hangs

Machine infos

• Operating system: Windows_NT
• Arch: x64
• VSCode: 1.100.3
• UI Kind: Desktop
• Ionide: 7.26.1
• Runtime: netcore
• Dotnet version: 9.0.200

[TheAngryByrd]

Thank you!