fix(gatsby-react-router-scroll): hide sessionStorage warnings in production

[aengl]

Hide sessionStorage warnings in production

Description

Concerns the plugin gatsby-react-router-scroll.

If cookies are disabled, the production version of the website would show console warnings when scrolling.

With this change, those warnings will only be visible in the development version.

Related Issues

Fixes #12577

[pieh]

This generally looks good, but I will change __DEV__ to process.env.NODE_ENV !== production. I realize we do use __DEV__ in other places in this plugin, but we really shouldn't - we don't use this is any other package and can be confusing, as this package have custom babel configuration.

But overall 👍

[aengl]

@pieh Agreed, I also prefer process.env.NODE_ENV,__DEV__ is always a bit magical 😄.

[pieh]

Thanks @aengl!

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[aengl]

@pieh Thank you for your guidance and effort, very much appreciated!