Throttle calls to spawn/kill under conpty
Throttle calls to spawn/kill under conpty

Part of #117956
Part of #121336
Part of #71966

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