fix: Re-add load_internal_reporting_country.py

[bmedx]

This was removed in Vertica deprecation, but is still needed. I'm re-adding it, minus the Vertica bits.

Analytics Pipeline Pull Request

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 #862 (0782403) into master (c014112) will decrease coverage by 0.00%. The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master     #862      +/-   ##
==========================================
- Coverage   76.43%   76.42%   -0.01%     
==========================================
  Files         151      152       +1     
  Lines       17170    17190      +20     
==========================================
+ Hits        13124    13138      +14     
- Misses       4046     4052       +6     

Impacted Files	Coverage Δ
...tasks/warehouse/load_internal_reporting_country.py	70.00% <70.00%> (ø)

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