Playwright expand coverage to group pages

[emilghittasv]

• Improving the groups_page.py page object and adding new locators & functions against them to be used in tests.
• Adding a function to click on groups listed inside the profile page.
• Adding user group tests pytest marker to pytest.ini
• Adding new test images for usage in tests.
• Expanding playwright coverage over the groups section via the test_groups.py
• Expanding playwright coverage into verifying that messages can be sent via the groups page inside the test_messaging_system.py
• Adding a couple of helper functions inside the utilities.py to:

1. Have the capability of uploading files via file choosers.
2. Have the capability of taking a screenshot for a particular locator.
3. Have the capability of comparing two given images using python pillow.