Lift max_running into generic python driver

[andreas-el]

Issue
Resolves #my_issue

Approach
Short description of the approach

Pre review checklist

• Read through the code changes carefully after finishing work
• Make sure tests pass locally (after every commit!)
• Wait for tests in CI to pass (see "checks" below)
• Prepare changes in small commits for more convenient review (optional)
• PR title captures the intent of the changes, and is fitting for release notes.
• Updated documentation
• Ensured new behaviour is tested (opened GUI? screenshots? tried workflows?)
• Commit history is consistent and clean, in line with the contribution guidelines.

Pre merge checklist

• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution
  guidelines.

[eivindjahren]

👍

[codecov-commenter]

Codecov Report

Merging #6027 (494f2bc) into main (d4ac0b9) will increase coverage by 0.14%.
Report is 3 commits behind head on main.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #6027      +/-   ##
==========================================
+ Coverage   82.53%   82.67%   +0.14%     
==========================================
  Files         352      352              
  Lines       21899    21811      -88     
  Branches      826      817       -9     
==========================================
- Hits        18074    18033      -41     
+ Misses       3526     3482      -44     
+ Partials      299      296       -3     

Files Changed	Coverage Δ
src/clib/lib/job_queue/queue_driver.cpp	88.23% <0.00%> (+10.99%)	⬆️
src/ert/job_queue/driver.py	97.95% <92.30%> (-2.05%)	⬇️

... and 7 files with indirect coverage changes

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[eivindjahren]

👍