Remove parachain staking lazy migration added in #3306

[RomarQ]

What does it do?

This pull request is a follow-up of #3306, which migrated the parachain staking pallet from the deprecated Currency trait to the modern Fungible trait, replacing the old lock-based system with a freeze-based mechanism.

The lazy-migration was performed in runtime 4000 and is no-longer needed.

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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 rq/remove-parachain-staking-lazy-migration

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[github-actions]

Moonbase Weight Difference Report

File	Extrinsic	Old	New	Change Percent

Moonriver Weight Difference Report

File	Extrinsic	Old	New	Change Percent

Moonbeam Weight Difference Report

File	Extrinsic	Old	New	Change Percent

[github-actions]

WASM runtime size check:

Compared to target branch

Moonbase runtime: 1992 KB (+4 KB) ⚠️

Moonbeam runtime: 2100 KB (-8 KB) ✅

Moonriver runtime: 2104 KB (-4 KB) ✅

Compared to latest release (runtime-4001)

Moonbase runtime: 1992 KB (+220 KB compared to latest release) ⚠️

Moonbeam runtime: 2100 KB (+236 KB compared to latest release) ⚠️

Moonriver runtime: 2104 KB (+240 KB compared to latest release) ⚠️

[github-actions]

Coverage Report

@@                              Coverage Diff                               @@
##           master   rq/remove-parachain-staking-lazy-migration      +/-   ##
==============================================================================
- Coverage   74.62%                                       74.50%   -0.12%     
- Files         394                                          392       -2     
- Lines       95725                                        95054     -671     
==============================================================================
- Hits        71429                                        70813     -616     
- Misses      24296                                        24241      -55     

Files Changed	Coverage
/pallets/parachain-staking/src/lib.rs	93.16% (-0.01%)	🔽
/pallets/parachain-staking/src/weights.rs	44.21% (+1.30%)	🔼
/runtime/common/src/migrations.rs	7.50% (-0.39%)	🔽
/runtime/moonbase/src/weights/pallet_parachain_staking.rs	24.81% (+0.84%)	🔼
/runtime/moonbeam/src/weights/pallet_parachain_staking.rs	24.81% (+0.84%)	🔼
/runtime/moonriver/src/weights/pallet_parachain_staking.rs	24.81% (+0.84%)	🔼

Coverage generated Mon Nov 24 16:52:33 UTC 2025