Mark tests for redis-stack

[dvora-h]

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

Please provide a description of the change here.

[codecov-commenter]

Codecov Report

Merging #2052 (a73fb9e) into master (95b3268) will decrease coverage by 0.47%.
The diff coverage is 38.96%.

@@            Coverage Diff             @@
##           master    #2052      +/-   ##
==========================================
- Coverage   91.68%   91.20%   -0.48%     
==========================================
  Files         100      100              
  Lines       21228    21248      +20     
==========================================
- Hits        19462    19379      -83     
- Misses       1766     1869     +103     

Impacted Files	Coverage Δ
tests/test_commands.py	94.62% <31.57%> (-1.67%)	⬇️
tests/test_scripting.py	93.58% <33.33%> (-6.42%)	⬇️
tests/test_bloom.py	99.55% <100.00%> (+0.01%)	⬆️
redis/commands/core.py	82.92% <0.00%> (-2.27%)	⬇️
tests/conftest.py	86.40% <0.00%> (-1.20%)	⬇️

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