Escaping of runInTerminal with spaces and single quotes makes launch fail

[fabioz]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.56.2
• OS Version: Linux (Ubuntu 18.02)
• BASH_VERSION:4.4.20 (1)-release

Note: this was initially reported in the python debugger (microsoft/debugpy#641), but after investigating, it appears to be an issue in VSCode itself (it may be a duplicate of #84235, but I'm not exactly sure that this is the case as that report is on Windows and this is on Linux).

Note: steps below on how to reproduce with the Python extension:

1. Create a directory test's test.
2. Add a file hello.py with the line print('test') within that directory
3. Try to debug hello.py with a launch configuration such as:

        {
            "name": "Python: Current File",
            "type": "python",
            "request": "launch",
            "program": "${file}",
            "console": "integratedTerminal",
        }

Note: putting the absolute path to the file instead of using ${file} also reproduces the issue.

Apparently the issue is that VSCode escapes ' to \' and then surrounds with " due to spaces in the path and that makes the launching fail as it'll try to search for a file in a test\'s test instead of test's test.

[roblourens]

This should now be fixed in latest Insiders