Extension causes high cpu load

- Issue Type: `Performance`
- Extension Name: `dotnet-test-explorer`
- Extension Version: `0.6.6`
- OS Version: `Windows_NT x64 10.0.18362`
- VSCode version: `1.33.1`

:warning: Make sure to **attach** this file from your *home*-directory:
:warning:`C:\Users\Alexandre Cahuê\formulahendry.dotnet-test-explorer-unresponsive.cpuprofile.txt`

Find more details here: https://github.com/Microsoft/vscode/wiki/Explain:-extension-causes-high-cpu-load

Check whether the referenced CPU profile is available, then reproduce the high CPU load with dotnet-test-explorer 0.6.6 on the reported Windows and VS Code versions. Trace the extension's test-explorer entry points and document the conditions that trigger the load; done means the issue is reproducible and the extension no longer causes sustained high CPU under those conditions.

Written by the indexing model from the issue text.