misc: fix benchmark script

[feedthejim]

Fixing + doing some maintenance as I was using it for some things.

Changes:

• fixed a bug related to how React is injected
• added a progress tracker for the numbers of requests
• retry on 500
• added a param for crashing the lambda manually (useful for cold boots)
• added a param to skip build, useful if you want to retest the same variation
• don't crash when there's no data to compare

Bug

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• Integration tests added
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Feature

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• e2e tests added
• Documentation added
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