[WIP] malus-collator: implement malicious collator submitting same collation to all backing groups

[sw10pa]

Issues

• [#5049] Elastic scaling: zombienet tests
• [#4526] Add zombienet tests for malicious collators

Description

Modified the undying collator to include a malus mode, in which it submits the same collation to all assigned backing groups.

TODO

• Implement the initial version of the malicious collator that submits the same collation to all backing groups;
• Avoid the core index check in the collation generation subsystem: https://github.com/paritytech/polkadot-sdk/blob/master/polkadot/node/collation-generation/src/lib.rs#L552-L553;
• Provide incremental CoreSelector in upward messages for both malus and normal collators;
• Resolve the mismatch between the descriptor and the commitments core index: collation-generation: resolve mismatch between descriptor and commitments core index #7104
• Add core assignment in same-collation-to-all-assigned-cores.toml using the assign-core.js script;
• Update the same-collation-to-all-assigned-cores.zndsl Zombienet test;
• Add PRdoc.

[alindima]

Looking good overall!

[alindima]

we need to add some better assertions, including some log checks that indeed validators got invalid candidates.
Also, if you want this test being run in the CI, it needs to be added to the gitlab config in polkadot.yml

[sandreim]

DSL is deprecated, we have a goal to port tests to Zombienet SDK.

[paritytech-workflow-stopper]

All GitHub workflows were cancelled due to failure one of the required jobs.
Failed workflow url: https://github.com/paritytech/polkadot-sdk/actions/runs/12946769122
Failed job name: test-linux-stable-no-try-runtime