Fix: File separator issue on Windows causing error: jest: got error running globalsetup cannot find module @angular\compiler-cli

[pal03377]

Summary

This fixes #2073

Test plan

• git clone https://github.com/pal03377/jest-preset-angular somewhere else
• cd jest-preset-angular from there
• npm install, then npm run build
• npm link to locally link this repo
• cd path/to/minimal-example from here https://github.com/pal03377/minimal-jest-pathsep-issue
• npm install, then npm link jest-preset-angular
• npm run test to verify that it now works

Does this PR introduce a breaking change?

• Yes
• No

[ahnpnl]

thanks!