fix: ensure non-TTY agents dont hang

[Skn0tt]

Closes microsoft/playwright#39986:

• prevents createFiles from hanging in quiet mode
• add --test-dir flag, which was only configurable interactively before

[karlhorky]

@Skn0tt I think there's still not a --no-gha flag for non-interactive rejection of GitHub Actions workflow files, as I mentioned here:

• [Feature]: create-playwright --no-gha option for AI-agent-friendly non-interactive setup playwright#39987

[Skn0tt]

I don't think that's needed, GitHub Actions workflow files are off unless --gha is passed. So --no-gha is the default.

[karlhorky]

that requires the --quiet flag, which hides the defaults

it's less obvious what this does:

pnpm create playwright --browser=chromium --test-dir=playwright --quiet

it would be easier to understand if you can just exhaustively pass in all options (this would break after your PR):

pnpm create playwright --browser=chromium --test-dir=playwright --no-gha

we're getting into the same conversation territory in the new PR, so I'll continue over here:

• fix: error on non-interactive terminals without --quiet #173 (comment)

[karlhorky]

The original issues #39986 and #39987 weren't actually resolved by this PR

There may be an option to complete this over here:

• fix: skip gha prompt when explicitly set #174