Specify the sbatch walltime

[morcuended]

• Remove --cpus-per-task=1 SBATCH param, since 1 processor per task is the default.
• Specify the walltime since we would need to schedule jobs in any partition
• Adapt tests accordingly

[codecov]

Codecov Report

Merging #128 (153572c) into main (ea02cfe) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #128   +/-   ##
=======================================
  Coverage   82.33%   82.33%           
=======================================
  Files          51       51           
  Lines        4901     4901           
=======================================
  Hits         4035     4035           
  Misses        866      866           

Impacted Files	Coverage Δ
osa/job.py	79.71% <ø> (ø)
osa/tests/test_jobs.py	100.00% <ø> (ø)

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