Sentry: Don't try to initialize WebGL context if not available

[oo-bldrs]

Most headless browsers do not have feature WebGL support yet the application tries to initialize it no matter what. This results in errors being deposited into Sentry each time a headless browser visits the page. (e.g. search engine crawling)

It would be useful if we could detect that the browser is lacking WebGL support and if it is, display a polite, friendly message and not attempt to initialize THREE and its dependents.

[sentry-io]

Sentry issue: SHARE-J