Default to Running Studio Without Strict Mode

[alextaing]

This PR adds a flag that will render Studio in React Strict Mode. Now, Studio runs without React Strict Mode by default, but can be specified to run in Strict Mode by adding strict as an argument to the empty -- flag (i.e. npx studio -- strict). This was also added to the dev command in the test site, but not the e2e-tests.

Since we are trying to access an env variable to determine a conditional render in Studio client-side, we cannot access process.env directly. Vite offers import.meta.env as a way for client-side modules to access env vars, but they must be prefixed with VITE_. This is why the env var is called VITE_STUDIO_STRICT.

J=SLAP-2966
TEST=manual

[nmanu1]

Did we want to look into this approach to achieve similar behavior?

[alextaing]

Did we want to look into this approach to achieve similar behavior?

Talked with Tom, and I think that he wants to get Strict mode working for now, then look into this later. I think there's a lot to test with regards to that change, and I think we want to get some QA feedback addressed first. We'll keep the item around, though!

[nmanu1]

Out of curiosity, what's the reasoning behind not wanting strict mode in e2e-tests?