refactor: use delphi_utils.logger instead of copied file

[dshemetov]

Addresses the comment here. Partial work from #1469.

Summary:

• use delphi_utils.logger everywhere instead of the copied logger.py file
• remove duplicate logger.py in this repo

Prerequisites:

• [x] Unless it is a documentation hotfix it should be merged against the dev branch
• [x] Branch is up-to-date with the branch to be merged with, i.e. dev
• [x] Build is successful
• [x] Code is cleaned up and formatted

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[dshemetov]

I rebased to get recent client changes and separated the whitespace changes in another commit and ignored that commit in blame.

[melange396]

whoops, the whitespace changes are still showing in blame: https://github.com/cmu-delphi/delphi-epidata/blame/dev/src/acquisition/covidcast/database.py#L125

i didnt realize it before i merged, but i think your force push changed the commit hashes :(