Neuron pruning based on registration date of UID

[VectorChat]

Description

This introduces a change to how the current get_neuron_to_prune function works. For ties with the lowest pruning score, the neuron that was registered oldest is chosen instead. If all neurons are immune, the same rules apply.

• includes a test function test_burn_registration_pruning_scenarios for testing out different scenarios.
• includes new utility function get_neuron_is_immune

Related Issue(s)

• Closes Neuron pruning from the subnets is unfair and always favors low UID numbers. #697

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Breaking Change

There are not any breaking changes to my knowledge.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have run cargo fmt and cargo clippy to ensure my code is formatted and linted correctly
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Screenshots (if applicable)

Please include any relevant screenshots or GIFs that demonstrate the changes made.

Additional Notes

Please provide any additional information or context that may be helpful for reviewers.

[JohnReedV]

Hello and thank you for your contribution!

It looks like the CI is failing due to some linting issues. Could you please address these by running
cargo clippy --workspace --all-targets --all-features -- -D warnings and making the necessary changes?

[VectorChat]

Alright, linting issues should be resolved now.

The base branch was changed.