SUBMARINE-1403. Preparing Submarine release 0.8.0-RC0

[cdmikechen]

What is this PR for?

Preparing for Submarine release 0.8.0-RC0

Notes:

1. workbench-v2 does not chang the versions (this is not yet developed and will not be merged into 0.8.0, but is planned to be merged into a new branch in the future).
2. submarine-v2 does not chang the versions (we will no longer support this).

What type of PR is it?

Feature

Todos

• - Move version from 0.8.0-SNAPSHOT to 0.8.0-RC0

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1403

How should this be tested?

CI

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 #1097 (a92859d) into branch-0.8 (4eb08ec) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           branch-0.8    #1097   +/-   ##
===========================================
  Coverage       66.83%   66.83%           
===========================================
  Files             130      130           
  Lines            6320     6320           
===========================================
  Hits             4224     4224           
  Misses           2096     2096           

Flag	Coverage Δ
python-integration	53.97% <100.00%> (ø)
python-unit	47.86% <100.00%> (ø)

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

Files Changed	Coverage Δ
...e-sdk/pysubmarine/submarine/client/api/auth_api.py	27.77% <ø> (ø)
...ysubmarine/submarine/client/api/environment_api.py	75.17% <ø> (ø)
...pysubmarine/submarine/client/api/experiment_api.py	45.51% <ø> (ø)
...ne/submarine/client/api/experiment_template_api.py	19.35% <ø> (ø)
...e/submarine/client/api/experiment_templates_api.py	15.55% <ø> (ø)
...ubmarine/submarine/client/api/model_version_api.py	10.61% <ø> (ø)
...k/pysubmarine/submarine/client/api/notebook_api.py	79.85% <ø> (ø)
...arine/submarine/client/api/registered_model_api.py	11.32% <ø> (ø)
...-sdk/pysubmarine/submarine/client/api/serve_api.py	19.51% <ø> (ø)
...-sdk/pysubmarine/submarine/client/configuration.py	62.82% <ø> (ø)
... and 25 more

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