Better detection for cookies for browser plugins report for hybrid consent #16101

Track actual cookie value so when implementing a hybrid consent screen where you first disable cookies and then enable cookies if consent given, then no new visitor is being created. If user doesn't give consent, then cookies stay disabled.

Setting actual cookie value is important because we include whether the user has cookies or not in the fingerprint: https://github.com/matomo-org/matomo/blob/3.13.6/core/Tracker/Settings.php#L145 . disableCookies / enableCookies otherwise creates a different fingerprint.

refs https://github.com/matomo-org/matomo/issues/13056

Creating this as part of 3.x since this is rather "urgently" needed as nowadays this behaviour is often wanted/needed and already used by various users.

build js