Use replaceAll when replacing separators

See here:
https://github.com/microsoft/vscode-python/security/code-scanning/10?query=ref%3Arefs%2Fheads%2Fmain

Issue Location:
https://github.com/microsoft/vscode-python/blob/2021.1.502429796/src/client/pythonEnvironments/base/info/interpreter.ts
https://github.com/microsoft/vscode-python/blob/2021.1.502429796/src/client/pythonEnvironments/info/interpreter.ts


