fix: delegation review

[dandanlen]

Pull Request

Some stuff that has come out of reviewing #6022 , in particular the thing about storing snapshots.

I need to review these changes again first. done

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[dandanlen]

This should be ready for review now.

[codecov]

Codecov Report

❌ Patch coverage is 99.24812% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
state-chain/pallets/cf-validator/src/delegation.rs	96%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[ramizhasan111]

a few comments but in general LGTM.