fix(jsutils): use optional chaining to prevent crash in browser

[michaelbirchler]

Context

We use contentful/live-preview. The library has graphql-js as a dependency.

Problem

If the DOM has an element with id="process" eg. <div id="process"></div> than the current implementation of utils/instanceOf would fail.

Current implementation:

globalThis.process != null && globalThis.process.env.NODE_ENV === 'production'

with this implementation globalThis.process will return the DOM element:

Because globalThis.process is true, the condition globalThis.process.env.NODE_ENV === 'production' gets executed and will result with an javascript error:

[linux-foundation-easycla[bot]]

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