@grafana/e2e: added support for plugin repositories (#22546)

* Minor changes

* Include Cypress support files in published package

* Added CLI

… with support for custom configurations (which Cypress does not currently support by default):

  * Loads cypress.json from @grafana/e2e as a base config (via a custom Cypress plugin)
  * Sets default values for project-level Cypress files (tests, etc)
  * Optionally loads a cypress.json from the current working directory as overrides

* Updated lockfile

packages/grafana-e2e/src/bin/grafana-e2e.ts

@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+import cli from '../cli/index';
+
+cli();

packages/grafana-e2e/src/cli/index.ts

@@ -0,0 +1,40 @@
+import { resolve, sep } from 'path';
+import execa, { Options } from 'execa';
+import program from 'commander';
+
+const cypress = (commandName: string) => {
+  // Support running an unpublished dev build
+  const parentPath = resolve(`${__dirname}/../`);
+  const parentDirname = parentPath.split(sep).pop();
+  const projectPath = resolve(`${parentPath}${parentDirname === 'dist' ? '/..' : ''}`);
+
+  const cypressOptions = [commandName, '--env', `CWD=${process.cwd()}`, `--project=${projectPath}`];
+
+  const execaOptions: Options = {
+    cwd: __dirname,
+    stdio: 'inherit',
+  };
+
+  return execa(`${projectPath}/node_modules/.bin/cypress`, cypressOptions, execaOptions)
+    .then(() => {}) // no return value
+    .catch(error => console.error(error.message));
+};
+
+export default () => {
+  const configOption = '-c, --config <path>';
+  const configDescription = 'path to JSON file where configuration values are set; defaults to "cypress.json"';
+
+  program
+    .command('open')
+    .description('runs tests within the interactive GUI')
+    .option(configOption, configDescription)
+    .action(() => cypress('open'));
+
+  program
+    .command('run')
+    .description('runs tests from the CLI without the GUI')
+    .option(configOption, configDescription)
+    .action(() => cypress('run'));
+
+  program.parse(process.argv);
+};