Skia deployment - enable auto renderer

[illia-romanenko]

Description
For skia site deployment, please enable auto renderer.

Acceptance Criteria

• auto renderer enabled
• on mobile browser HTML version is dislpayed
• on desktop browser Skia version is dislpayed

Additional context
flutter/engine#21852

[solid-yuriiuvarov]

We performed an additional investigation and figured out some blockers for this ticket.
The main trick is to rework the isSkia method of the WebPlatform class. This reworking requires the universal_io package to be used as the standard dart:io doesn't implement the Platform.isAndroid and Platform.isIOS methods. However, the latest version of the universal_io has an issue in validating iOS systems. Reducing the package version is impossible as well since we're using the universal_html package depending on the latest universal_io.
Thus, because of the packages' issues and dependency limitations we have, we cannot complete this ticket at the moment.

[bootstraponline]

Can we fix the issue in universal_io to unblock this ticket? I’m not sure is upstream is going to fix this anytime soon.

[illia-romanenko]

@bootstraponline we'll take a look further, thanks!