Deselect integration tests in Tests CI

[not522]

Motivation

Currently, samplers_tests/test_samplers.py and importance_tests/test_init.py require integration libraries.

Description of the changes

This PR will add an integration marker and test integration samplers / importance-evaluators in the integration tests CI.

[not522]

Please merge #3983 first.

[codecov-commenter]

Codecov Report

Merging #4013 (ff9f5b6) into master (8917a51) will increase coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4013      +/-   ##
==========================================
+ Coverage   90.10%   90.12%   +0.01%     
==========================================
  Files         162      162              
  Lines       12746    12746              
==========================================
+ Hits        11485    11487       +2     
+ Misses       1261     1259       -2     

Impacted Files	Coverage Δ
optuna/integration/botorch.py	98.26% <0.00%> (+0.86%)	:arrow_up:

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[not522]

I updated this PR. We can test basic features using pytest tests -m "not integration" and integrations using pytest tests -m "integration".

[HideakiImamura]

@c-bata Could you review this PR?

[github-actions[bot]]

This pull request has not seen any recent activity.

[HideakiImamura]

@not522 Any update on this friendly reminder :)

[not522]

I updated the PR. Please take another look.

[c-bata]

@not522 Sorry again for the delay and thank you for your huge effort :bow: There seems to be some conflicts due to #4150. Could you resolve it?

[c-bata]

LGTM! I've just enabled auto-merge so that it will be merged after passed all required tests :pray: Thank you for the update.