testing: allow waiting for server before running unit tests
testing: allow waiting for server before running unit tests

Fixes https://github.com/microsoft/vscode/issues/121751

Krzysztof-Cieslak/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,eamodio/vscode,microsoft/vscode,Microsoft/vscode,eamodio/vscode,Microsoft/vscode,eamodio/vscode,eamodio/vscode,eamodio/vscode,eamodio/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,microsoft/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,eamodio/vscode,microsoft/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,microsoft/vscode,eamodio/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,microsoft/vscode,eamodio/vscode,Microsoft/vscode,eamodio/vscode,eamodio/vscode,Krzysztof-Cieslak/vscode,eamodio/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,microsoft/vscode,microsoft/vscode,eamodio/vscode,microsoft/vscode,Microsoft/vscode,microsoft/vscode,eamodio/vscode,eamodio/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,microsoft/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,microsoft/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,eamodio/vscode,microsoft/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,Krzysztof-Cieslak/vscode,Microsoft/vscode,eamodio/vscode