SUBMARINE-1396. Split experiment-prehandler test into separate action

[cdmikechen]

What is this PR for?

The image build of experiment-prehandler resulted in a no space left on device exception. Now split experiment-prehandler build to a standalone script.
Currently, the e2e test already contains experiment-prehandler experiment related codes (a new issue has been created to handle unit test https://issues.apache.org/jira/browse/SUBMARINE-1397), so for now remove pyhton test.

What type of PR is it?

Hot Fix

Todos

• - Strip experiment-prehandler from python tests

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1396

How should this be tested?

CI test

Screenshots (if appropriate)

NA

Questions:

• Do the license files need updating? No
• Are there breaking changes for older versions? No
• Does this need new documentation? No

[codecov]

Codecov Report

Merging #1093 (31f058d) into master (0a554c4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1093   +/-   ##
=======================================
  Coverage   67.27%   67.27%           
=======================================
  Files         128      128           
  Lines        6224     6224           
=======================================
  Hits         4187     4187           
  Misses       2037     2037           

Flag	Coverage Δ
python-integration	54.20% <ø> (+0.58%)	⬆️
python-unit	48.00% <ø> (ø)

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