Removes docker-image-py dependency

[thomasjpfan]

This PR removes the docker-image-py dependency.

Type

• Housekeeping

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

Instead of using docker-image-py, we can use the docker library, to parse the tag.

Tracking Issue

Towards flyteorg/flyte#4418

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c275011) 62.54% compared to head (79873e3) 93.24%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1978       +/-   ##
===========================================
+ Coverage   62.54%   93.24%   +30.70%     
===========================================
  Files         313       88      -225     
  Lines       23249     4188    -19061     
  Branches     3526        0     -3526     
===========================================
- Hits        14540     3905    -10635     
+ Misses       8286      283     -8003     
+ Partials      423        0      -423     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[eapolinario]

Thank you!

docker-image-py is another case of a library that was covering a much larger number of use cases than its counterpart in docker. For our usage though, I have a feeling that docker-image-py is not needed.