Ability to disable headless mode using cli opiton

### Description

In a project created with `npm init testplane@latest` headless mode is enabled by default. If the user wants to turn it off for one run, then he must use the option `--healdess=false` or `--headless=0` or `--headless=no`. But it doesn't work. It is necessary to support this opportunity.

### Verify latest release

- [x] I verified that the issue exists in the latest Testplane release

### Testplane version

_No response_

### Last Testplane version that worked

_No response_

### Which area(s) of Testplane are affected? (leave empty if unsure)

CLI

### Link to the code that reproduces this issue or a replay of the bug

_No response_

### Reproduction steps

- npm init testplane@latest (in some test folder)
- npx testplane --headless=false

### Actual Behavior

Get an error like:
```
Error: "headless" option should be "new" or "old", but got "false"
// ...
```

### Expected Behavior

Headless mode is disabled.

### Which Node.js version are you using?

v18.12.1