[soveriegn] Chain sim test incoming header zero finality

[mariusmihaic]

Reasoning behind the pull request

• Different extensive incoming header scenarios in chain simulator for sovereign block processing

Proposed changes

• Test1

  // In this test we simulate:
  // - a sovereign chain with the same round time as mainnet
  // - for each generated block in sovereign chain, we receive an incoming header from mainnet

• Test2

  // In this test we simulate:
  // - a sovereign chain with a lower round time than mainnet
  // - we will receive a mainnet block at every 3 generated sovereign blocks

• Test3

  // In this test we simulate:
  // - a sovereign chain with a higher round time than mainnet
  // - we will receive 3 mainnet block for every generated sovereign blocks

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?