docs: update testEnvironment and testEnvironmentOptions doc

[ahnpnl]

Summary

Update testEnvironment and testEnvironmentOptions docs to indicate clearer:

• what are possible values for testEnvironment and how to configure a custom one
• what are possible properties for testEnvironmentOptions

Test plan

Green CI

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commit: eb33c36

[ahnpnl]

Hi @cpojer @SimenB would you please this? I reworked the doc taking inspiration from Vitest