* Added handler for older version of EventSupplierSlashed

[Alann27]

Summary

• Added handler for older version of EventSupplierSlashed
• Fixed getEntityIdArg when calling indexStakeEntity for the following events: poktroll.service.EventRelayMiningDifficultyUpdated and poktroll.tokenomics.EventSupplierSlashed

Issue

In alpha are poktroll.tokenomics.EventSupplierSlashed events emitted with an older version (not the actual as specified in poktroll proto files). You can see an example in the height 57750

Also we were not handling correctly the id of the entities for the poktroll.service.EventRelayMiningDifficultyUpdated event.

Type of change

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• New feature, functionality or library
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Sanity Checklist

• I have tested my changes using the available tooling
• I have commented my code
• I have performed a self-review of my own code; both comments & source code
• I create and reference any new tickets, if applicable
• I have left TODOs throughout the codebase, if applicable