feat: remove date column in DiseasystoreGoogleCovid19

[RasmusSkytte]

Intent

fixes #44

Approach

Removed the date column from the output of google_covid_19_metric

Known issues

N/A

Checklist

• The PR passes all local unit tests
• I have documented any new features introduced
• If the PR adds a new feature, please add an entry in NEWS.md
• A reviewer is assigned to this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d118eb8) 96.06% compared to head (d6d44dd) 96.05%.

❗ Current head d6d44dd differs from pull request most recent head 4661c11. Consider uploading reports for the commit 4661c11 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   96.06%   96.05%   -0.02%     
==========================================
  Files          11       11              
  Lines         686      684       -2     
==========================================
- Hits          659      657       -2     
  Misses         27       27              

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