BLD: Fix slurm CI/CD workflow

[Dawnfz-Lenfeng]

What do these changes do?

• The previous setup relied on the default base environment provided by the conda environment in the image daskdev/dask-jobqueue:slurm.
• However, the intended environment is dask-jobqueue.
• To ensure the correct environment is used, a new custom slurmbase image is now manually created, and the dask-jobqueue environment is activated within the image.

Related issue number

Fixes #xxxx

Check code requirements

• tests added / passed (if needed)
• Ensure all linting tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.71%. Comparing base (310a866) to head (629d44c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #801   +/-   ##
=======================================
  Coverage   80.71%   80.71%           
=======================================
  Files        1070     1070           
  Lines       80004    80004           
  Branches    16521    16521           
=======================================
+ Hits        64575    64578    +3     
+ Misses      13872    13863    -9     
- Partials     1557     1563    +6     

Flag	Coverage Δ
unittests	80.67% <ø> (+<0.01%)	⬆️

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[luweizheng]

LGTM