Remove dockerfiles from subfolder

[pingsutw]

Why are the changes needed?

All the docker files in the subfolder are unused and outdated.

What changes were proposed in this pull request?

Remove them

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ac42562) 58.13% compared to head (0969ded) 58.15%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4715      +/-   ##
==========================================
+ Coverage   58.13%   58.15%   +0.01%     
==========================================
  Files         626      626              
  Lines       53786    53786              
==========================================
+ Hits        31271    31277       +6     
+ Misses      20007    20001       -6     
  Partials     2508     2508              

Flag	Coverage Δ
unittests	58.15% <ø> (+0.01%)	⬆️

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[pingsutw]

cc @pmahindrakar-oss

[pmahindrakar-oss]

Can we also have make docker_build work for each component so that it picks the right Dockerfile based on the component
Eg : If you are inside flytepropellerdirectory and you do make docker_build then it picks Dockerfile.propeller and builds that.

Cloud repo has this convention. Happy to have this as separate ticket too. Thanks for taking care of this

[pingsutw]

That's a good idea. I'll add that in a separate PR.