agreement: faster TestRandomizedEncodingFullDiskState

[cce]

Summary

The change in #6455 removed msgp.Raw from the message type which meant errSkipRawMsgpTesting was no longer returned when calling protocol.RandomizeObject in TestRandomizedEncodingFullDiskState. This made the test 7x slower (~75s to ~530s). These changes hope to bound the number of iterations and size of random maps/slices made to keep the test times faster. In this PR it takes 27s.

Test Plan

Existing test should pass and not take longer than 10m

[Copilot]

Pull Request Overview

This PR optimizes the TestRandomizedEncodingFullDiskState test which became 7x slower after a previous change. The optimization adds bounds to randomized collection sizes and provides configuration options to silence warning messages during testing.

• Added configuration options to limit randomized slice/map lengths and silence allocation warnings
• Modified test to use smaller collection sizes (8 instead of 32) and fewer iterations (1000/500 instead of 5000)
• Updated randomization functions to accept and use the new configuration parameters

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
protocol/codec_tester.go	Added configuration options for max collection length and silencing warnings, updated randomization logic to use these bounds
agreement/persistence_test.go	Applied new configuration options to limit test execution time and reduce collection sizes

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