remove RT4100 migrations

[librelois]

What does it do?

Remove migrations executed at runtime version 4100.

What important points should reviewers know?

Is there something left for follow-up PRs?

What alternative implementations were considered?

Are there relevant PRs or issues in other repositories (Substrate, Polkadot, Frontier, Cumulus)?

What value does it bring to the blockchain users?

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch elois-remove-4100-migrations

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[github-actions]

WASM runtime size check:

Compared to target branch

Moonbase runtime: 2120 KB (-4 KB) ✅

Moonbeam runtime: 2240 KB (no changes) ✅

Moonriver runtime: 2240 KB (no changes) ✅

Compared to latest release (runtime-4100)

Moonbase runtime: 2120 KB (+184 KB compared to latest release) ⚠️

Moonbeam runtime: 2240 KB (+208 KB compared to latest release) ⚠️

Moonriver runtime: 2240 KB (+208 KB compared to latest release) ⚠️

[github-actions]

Coverage Report

@@                       Coverage Diff                        @@
##           master   elois-remove-4100-migrations      +/-   ##
================================================================
- Coverage   76.68%                         76.65%   -0.03%     
- Files         389                            388       -1     
- Lines       76615                          76448     -167     
================================================================
- Hits        58745                          58598     -147     
- Misses      17870                          17850      -20     

Files Changed	Coverage
/pallets/parachain-staking/src/tests.rs	98.99% (+0.07%)	🔼
/runtime/common/src/migrations.rs	0.00% (-4.29%)	🔽

Coverage generated Thu Dec 18 14:35:05 UTC 2025

[RomarQ]

The unused dependencies check is failing