fix(x/slashing): consensus failure after cons key rotation

[atheeshp]

Description

validator signing info won't be in state after rotation, if we get the signing info with old one it'll will stop the chain.
so we need to update to use ValidatorByConsAddr which will get the validator details with the old consensus address as well.

ref: #18141

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[coderabbitai]

Walkthrough

The updates across the files reflect a more robust approach to handling validator status changes in a blockchain network. The logic now includes additional steps to verify a validator's jailed status by fetching the latest information and considering the possibility of consensus key rotations, ensuring that the system accurately reflects the current state of validators and their signing information.

Changes

Files	Summary
x/slashing/keeper/infractions.go	Modified the logic for checking jailed validators to include fetching validator info and re-reading the consensus address.
x/slashing/keeper/signing_info.go x/slashing/keeper/signing_info_test.go	Updated the performConsensusPubKeyUpdate function to handle consensus address conversion and signing info address updates, and modified the associated test to reflect the new address handling.

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[github-actions]

@atheeshp your pull request is missing a changelog!

[atheeshp]

@atheeshp your pull request is missing a changelog!

it's not needed, rotate cons-key isn't released yet.