fix(testing): fix tests for Windows

[Tlacenka]

In this PR, I identified and fixed various issue while running tests in the Windows environment:

• shell needs to be specified to run programs in command shell on Windows, as described here
• path notation on Windows is different
• JSON formatting is different for UNIX and Windows
• writing into files replaced by echo command which works seamlessly on Windows
• glob patterns require extra quotation marks for argument expansion on Linux
• recreating tmp folder caused issues for me so I partially fixed it via adding the recursive option

Note: This is the same scope as #131. Unfortunately, merging changes from the test refactor did not go well so I started off a clean branch and re-applied the changes.

[matejchalk]

Well done and thanks for sticking with it 😅 Great that the ESLint plugin will now work on Windows, too 👍

[BioPhoton]

I thought so that the last big test refactoring will break any other one related to testing.

Happy you made it!