SUBMARINE-1383. Update submarine-sdk generated client api

What is this PR for?

With the upgrade, we have fixed fixed an issue in server openapi endpoint caused by missing dependency in the meantime. At the same time, in order to ensure the validity of the openapi-generator-cli generated codes, we continue to use the old code generation method for the time being.

Also, given the range of codes involved, we haven't upgraded the openapi-generator-cli version yet. After local testing, there are significant changes with each version of 5.0 or 6.0. We'll stick with 4.3.1 for the time being until we know that major changes are needed.

What type of PR is it?

Bug Fix

Todos

[x] - Update sdk api by gen-sdk.sh (keep openapi-generator-cli method with keeping python2 and python3).
[x] - Fix submarine server openapi endpoint error.
[x] - Add a test case for openapi endpoint.

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1383

How should this be tested?

Git CI

Screenshots (if appropriate)

Questions:

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

Codecov Report

Merging #1069 (4f5e672) into master (b830ac4) will decrease coverage by 8.73%. The diff coverage is 35.07%.

@@            Coverage Diff             @@
##           master    #1069      +/-   ##
==========================================
- Coverage   75.98%   67.25%   -8.73%     
==========================================
  Files         119      127       +8     
  Lines        5000     6139    +1139     
==========================================
+ Hits         3799     4129     +330     
- Misses       1201     2010     +809

Flag	Coverage Δ
python-integration	`54.01% <35.07%> (-5.71%)`	:arrow_down:
python-unit	`48.06% <25.59%> (-4.42%)`	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ine-sdk/pysubmarine/submarine/client/exceptions.py	`35.29% <7.69%> (+1.29%)`	:arrow_up:
...ubmarine/submarine/client/api/model_version_api.py	`10.61% <10.61%> (ø)`
...arine/submarine/client/api/registered_model_api.py	`11.32% <11.32%> (ø)`
...e/submarine/client/api/experiment_templates_api.py	`15.55% <15.55%> (ø)`
...ne/submarine/client/api/experiment_template_api.py	`19.35% <19.35%> (ø)`
...-sdk/pysubmarine/submarine/client/api/serve_api.py	`19.51% <21.21%> (+3.05%)`	:arrow_up:
...pysubmarine/submarine/client/api/experiment_api.py	`45.51% <39.00%> (-6.22%)`	:arrow_down:
...ne/client/models/experiment_template_param_spec.py	`41.89% <41.89%> (ø)`
...ubmarine/client/models/experiment_template_spec.py	`42.39% <42.39%> (ø)`
...submarine/client/models/registered_model_entity.py	`42.39% <42.39%> (ø)`
... and 21 more

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apache / submarine