Integration test consensus signing

[ssd04]

Description of the reasoning behind the pull request (what feature was missing / how the problem was manifesting itself / what was the motive behind the refactoring)

• Integration test for consensus signing

Proposed Changes

• added new integration test in consensus, with changes regarding multiSigner and signing components
• use real components for singing in consensus integration tests, instead of using mocks
• fix issue in crypto components where private key bytes was not set

Testing procedure

• N/A

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (feat/optimise-consensus-sigcheck@41d4ff2). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 7dba9e5 differs from pull request most recent head 34b0c36. Consider uploading reports for the commit 34b0c36 to get more accurate results

Additional details and impacted files

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##             feat/optimise-consensus-sigcheck    #4506   +/-   ##
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  Misses                                      ?    20273           
  Partials                                    ?     4508           

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