Add UI Tests using Playwright with BDD

[nabim777]

Description

• In this PR, there are UI tests using Playwright and Behavior-Driven Development (BDD) with Gherkin syntax.
• Test scenario included:

- User logs in with valid credentials.
- Login with invalid username and password.
- User creates a new project.
- User logs out successfully.

• Additionally, continuous integration (CI) has been implemented to run these tests automatically during the CI pipeline.
• Axios used for making API calls in some tests.

---

NOTE
To keep this PR small, I’ve focused on these key scenarios. If you like, I’d be happy to add more test scenarios in future contributions. Test scenarios that can be added in the future contributions are like

- create a user
- delete a user
- rename a user
- delete a project
- rename a project
- edit the project background
- create a new project board
and other CRUD operations on board and user

If there is any suggestions or feedback, I’d love to hear them!

[CLAassistant]

All committers have signed the CLA.

[meltyshev]

Hi! Thanks for the tests and for your contribution 🙏

[nabim777]

Hi! You're very welcome 🙏. I'm glad I could contribute!