Add Produce extension stages

[ryan-gang]

Description

• Added extensive produce tests covering multiple stages (P1, P3, P4, P5, P6, P7) including multi-topic, multi-partition, and multi-batch scenarios.
• Updated and simplified produce request and response builders, ensuring correct correlation ID handling and response expectations.
• Improved test coverage with new regex patterns, fixtures, and log assertions.
• Refactored test code for consistency, reducing redundancy in partition response handling and record batch creation.
• Fixed various issues related to stage slugs, error contexts, and test output normalization.
• Enhanced local testing setup with updated scripts and Dockerfile for Kafka environment.

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This is part 3 of 3 in a stack made with GitButler:

•  3  Add Produce extension stages #88 👈
•  2  Refactor kafka log directory setup #84
•  1  Add Produce assertions #80

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[cursor]

Bug: Test Fails Due to Duplicate Partitions

The random.RandomInts(0, 3, 2) call can return duplicate partition numbers. This causes the test to attempt to produce two different record batches to the same partition within a single Produce request, contradicting the test's goal of testing multiple distinct partitions. This leads to incorrect test logic and potentially undefined test behavior.

Locations (1)

• internal/stage_p6.go#L35-L36