add improved error messaging in Worker class

[OVI3D0]

Description

Adds more detailed error messaging to the console if a request fails or if a workload is improperly configured.

Example:

[ERROR] Cannot execute-test. Benchmark operation failed:
Worker ID: 0
Task: index-statrs
Workload: geonames
Test Procedure: append-no-conflicts
Cause: Unknown
Error: No runner available for operation type [index-statrs]

Issues Resolved

#715

Testing

• New functionality includes testing
  make test

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