fix tests on windows

[timmyichen]

Description

Fixes an issue around running tests on windows.

• Changed single quotes to escaped double quotes everywhere per Unable to run with serve npm package bahmutov/start-server-and-test#293
• Replaced ; with && for windows compat (see this relevant issue for detailed explanation: Non-standard command line parsing misinterprets semicolons inside arguments microsoft/terminal#13264)

Tested by running npm run test on both mac and windows using this branch and ensuring that the test started as expected (did not wait for test completion)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• This change requires an update to testing

Issue

• Is this related to a specific issue? If so, please specify:

Checklist:

• This PR is up to date with the development branch, and merge conflicts have been resolved
• I have executed npm run test and all tests have passed successfully or I have included details within my PR on the failure.

^ i have executed npm run test and verified it starts without throwing an error

• Some windows users may not be able to execute this command. Please proceed with the PR if that is the case.
• I have executed npm run lint and resolved any outstanding errors. Most issues can be solved by executing npm run format
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

[Caleb-Cohen]

This PR will pass now. A previous test failed but was reported as a success causing the PR to be improperly approved.

[Caleb-Cohen]

@timmyichen unlike the first error I am unable to reproduce this one in my local.