Add descriptive fail log upon init failure.

[doctoryes]

Analytics Pipeline Pull Request

When the LoadInsightsToVertica command fails upon one of the dependency checks, it's currently difficult to tell which table failed. This log will help the next person debugging this task.

Make sure that the following steps are done before merging:

• [ ] If you have a migration please contact data engineering team before merging.
• [ ] Before merging run full acceptance tests suite and provide URL for the acceptance tests run.
• [ ] A member of data engineering team has approved the pull request.

[codecov[bot]]

Codecov Report

Merging #795 into master will decrease coverage by 0.01%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #795      +/-   ##
==========================================
- Coverage   74.53%   74.52%   -0.02%     
==========================================
  Files         211      211              
  Lines       24193    24197       +4     
==========================================
  Hits        18032    18032              
- Misses       6161     6165       +4

Impacted Files	Coverage Δ
...alytics/tasks/warehouse/load_warehouse_insights.py	55.76% <0%> (-4.65%)	:arrow_down:

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