Test cases was added for AfterEpochEnd function

[AbdulSamad876]

Description

Closes: #XXXX

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• confirmed the correct type prefix in the PR title
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[Tanyaml]

Not QA testable.

[MikeSofaer]

Doesn't this show that delegators are not being paid?

[faisalnaveedRNS]

1. artist distribution
2. validator distribution
3. bedrock holder distribution (deligators)

[faisalnaveedRNS]

Test cases should cover specially token encomics

[StefanB90]

Refactor test case to make it more readable. Focus on executable test.

[MikeSofaer]

This test is relying on the CalculateDelegatorsRewards to create the list of people who should be paid out, I would like it to instead get the list of Bedrock holders and validators from the chain and use that to iterate. The current method is checking against itself a little too much.

[Tanyaml]

Show that validators are getting paid and see how the the tokens work as intended and test on mutilsig. @faisalnaveedRNS