GetDelegatorReward fix

[stana-miric]

Description

This fix includes changes in GetDelegatorReward fn where getValidatorReward was wrongly called on ChildValidatorSet contract instead of getDelegatorReward. Also, it includes modifications in TestE2E_Consensus_Delegation_Undelegation where proper key (delegator's) is now used for sending delegate, undelegate and withdraw requests and some minor test improvements.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

[Stefan-Ethernal]

🚀

[codecov]

Codecov Report

Merging #1194 (7a53d4e) into develop (f434a9b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1194   +/-   ##
========================================
  Coverage    54.68%   54.68%           
========================================
  Files          176      176           
  Lines        23553    23553           
========================================
  Hits         12880    12880           
  Misses        9645     9645           
  Partials      1028     1028           

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