fix: Place .playwright directory under bin directory

[filzrev]

This PR intended to fix issue #10398.
By temporary revert commit (#9363)

Background
When using PLAYWRIGHT_NODEJS_PATH environment variable.
../../.playwright fallback from bin directory is not used.
And failed to find .playwright\package\cli.js file.

• https://github.com/microsoft/playwright-dotnet/blob/main/src/Playwright/Helpers/Driver.cs#L89-L90
• https://github.com/microsoft/playwright-dotnet/blob/main/src/Playwright/Helpers/Driver.cs#L145

To fix problems. it need to change playwright-dotnet side code
(or install chromium browser directly by calling .playwright/package/cli.js)

So I've temporary reverted #9363 code. And place .playwright folder under bin directory.
By this changes. .nupkg size increased about 1.8MB.