chore(gossipsub): improve test structure

[jxs]

Description

Improve gossipsub behavior tests structure.
Split the already big enough file into multiple test files according to their Behaviour tests category.
Document the shared test primitives and rename structures, InjectNodes to BehaviourTestBuilder and remove the inject_nodes functions to use Default.

This will help with the new tests for partial messages on sigp#577 which will be eventually moved here

[dknopik]

LGTM, very good improvement!

[mergify]

Merge Queue Status

✅ The pull request has been merged at 7bf4f2d

This pull request spent 21 seconds in the queue, with no time running CI.
The checks were run in-place.

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  • chore(gossipsub): improve test structure #6232
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