Incompatible with mocha 10

[birtles]

Describe the bug
After upgrading to mocha 10, playwright-test fails with:

Error: R] Could not resolve "mocha/mocha-es2018.js"

    node_modules/playwright-test/src/setup-mocha.js:6:18:
      6 │ import mocha from 'mocha/mocha-es2018.js'
        ╵                   ~~~~~~~~~~~~~~~~~~~~~~~

It looks like the mocha-es2018.js artifact was dropped in mochajs/mocha@70fe3ad as part of mochajs/mocha#4848.

I guess we should just use mocha.js but I wonder if there was a reason for using mocha-es2018.js in the first place?

[hugomrdias]

Should be fixed in v8, thank you for the issue.