Implement E2E test scenario to cover playground functionality verification

[odockal]

Is your enhancement related to a problem? Please describe

Automate a e2e test case to cover Playground functionality.

Describe the solution you'd like

Implement a e2e test case using Playwright testing framework to cover Playground creation.

1. Extension is installed
2. Podman Machine is set (win, mac)
3. Open Catalog
4. Download a model to be used in playground
5. Check model presence
6. open Playgrounds -> New playground
7. chose a name for playground, select model -> Create playground
8. Check playground was created
9. open playground details
10. Check value in the page
11. Define system prompt
12. Fill user input and send the request
13. Check model's response
14. Delete playground

Describe alternatives you've considered

No response

Additional context

This is basic smoke scenario, we might consider different models, etc. please create follow up issue to cover another advanced functionality.