Pass `context` to `PlaywrightEnvironment`'s parent (`RootEnv`)

[juan-fernandez]

Fixes #819

This is how jest recommends creating your own test environment (jest docs):

// my-custom-environment
const NodeEnvironment = require('jest-environment-node').TestEnvironment;

class CustomEnvironment extends NodeEnvironment {
  constructor(config, context) {
    super(config, context); // see context here
    console.log(config.globalConfig);
    console.log(config.projectConfig);
    this.testPath = context.testPath;
    this.docblockPragmas = context.docblockPragmas;
  }