Typescript: Headless mode (run test) does not work

[quockhanh]

Step to reproduce:

1. Create new project with Typescript
2. Add one or few test cases
3. Gen code
4. Run test with Headless mode

Expectation: App runs test without browser appearance Actual: App runs test with all available browsers (my local is: Chromium, Firefox, and Webkit) -- see image

TODO: Step 1:

• Research whether playwright-typescript support Headless mode or not
• If yes, we should keep this Headless option and fix it (as .NET project). Otherwise, remove this option

Step 2:

• For playwright/typescript project, should we add new option like All browsers?
• If select, then run with all available browsers on that machine/environment. Then make it as default option
• IMPORTANT: This step neeed @veebs and @brogreenmoon 's confirmation

[brogreenmoon]

Confirmed successful execution as typescript - headless.

I don't think we need an "All browsers" option yet. Maybe later.