feat(tests): Integrate Playwright for end-to-end testing

[antonbsa]

What does this PR do?

This PR introduces the setup with E2E tests for the Actions button dropdown and Actions bar samples using Playwright:

• Action button dropdown:
  • should display and log when clicked
• Action bar:
  • should log expected message when custom SVG button is clicked
  • should handle selector button click and log expected values
  • should verify selector icon has correct class
  • should handle toggle group button click and log expected values

In addition:

• Creates Playwright configuration globally (extended in the samples folder);
• Adds core constants and helper functions for managing test parameters and settings;
• Updates the package.json files to include new dependencies and test scripts;
• Modifies .eslintrc to include overrides for test files and samples, allowing specific rules to be turned off for these files;
• Adds /scripts/copy-sample-to-container.sh script file to facilitate testing in a development environment;

More

• A BBB server running is required as the plugin is injected through the pluginManifests create parameter into a session;
• The plugins tests require BBB credentials (server and secret), the same ones used in BBB core testing - can be copied and pasted from the core testing folder to the root SDK directory (see .env.template);

[welcome]

Thank you for this contribution! Could you please confirm if you already sent in the signed Contributor License Agreement? See https://docs.bigbluebutton.org/support/faq.html#why-do-i-need-to-sign-a-contributor-license-agreement-to-contribute-source-code Thanks in advance!

[GuiLeme]

LGTM!