Core: Fix process.env assignment

[shilman]

Issue: #17128

What I did

Remove process.env definition.

• This makes process.env.FOO = 'bar'; succeed.
• However, it means const { FOO } = process.env; will fail

Given that nobody complained about the latter and lots of people are complaining about the former, I think this is a good tradeoff.

@tmeasday there's probably a smarter way to get both cases. Any ideas?

How to test

See updates to react-ts example

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[tmeasday]

Hmmm. Ok. LGTM. Can't see anyway to allow both

[havenchyk]

@shilman @tmeasday guys I use msw as storybook addon and this PR doesn't allow me to read API URL I pass from as environment variable in the story. Can you suggest any workaround? found the linked issue