Being able to send mocha options to test runner script [API-1599]

[srknzl]

Things get complicated when we want to pass several arguments to mocha. Right now we can pass a pattern to test script like this:
npm run test pattern

This sets -g option of mocha behind the scenes. We cannot give any other option right now.

It would be better to be able give mocha options like this:

npm run test -g pattern -b

[srknzl]

looks like options are not passed to underlying command directly. one can use npx mocha to do this

[srknzl]

possible via https://stackoverflow.com/a/14404223

[github-actions]

Internal Jira issue: API-1599