Use maxprocesses=2 for cli tests

[JHolba]

Lowering the amount of processes used for cli tests to see if it helps flaky ensemble evaluator

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[eivindjahren]

👍

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.71%. Comparing base (ca68c84) to head (fe1ede3).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9089      +/-   ##
==========================================
+ Coverage   90.68%   90.71%   +0.02%     
==========================================
  Files         350      350              
  Lines       21778    21778              
==========================================
+ Hits        19750    19756       +6     
+ Misses       2028     2022       -6     

Flag	Coverage Δ
cli-tests	39.03% <ø> (+<0.01%)	⬆️
gui-tests	71.71% <ø> (+0.02%)	⬆️
performance-tests	49.24% <ø> (ø)
unit-tests	79.56% <ø> (+0.01%)	⬆️

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