Introduction To React Testing: Move Vitest globals and ESLint note

[dsmchen]

Because

• "Vitest globals and ESLint" note makes more sense in "Setting up a React testing environment" section

This PR

• Moved "Vitest globals and ESLint" note from "Our first query" section to "Setting up a React testing environment" section

Issue

Closes #XXXXX

Additional Information

https://discord.com/channels/505093832157691914/704694394632011808/1468834840723062844

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