SUBMARINE-1342. Remove experiment template cache in server

[cdmikechen]

What is this PR for?

The current experimental templates are cached on the submarine-server, so if the deployment replica of the submarine-server is greater than 1 or if the data in the database has changed, the cache cannot be triggered to update.

What type of PR is it?

Bug Fix

Todos

• [x] - Remove cache

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1342

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[bot]]

Codecov Report

Merging #1088 (89ea680) into master (b0d96b3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1088   +/-   ##
=======================================
  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> (ø)
python-unit	48.00% <ø> (ø)

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