Make QueueConfig serializable

[oyvindeide]

Issue
Resolves #my_issue

Approach
Short description of the approach

(Screenshot of new behavior in GUI if applicable)

• 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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.74%. Comparing base (8c679c1) to head (1146983).

Files with missing lines	Patch %	Lines
src/ert/config/queue_config.py	95.00%	1 Missing ⚠️
src/ert/scheduler/__init__.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9143      +/-   ##
==========================================
- Coverage   90.78%   90.74%   -0.05%     
==========================================
  Files         351      351              
  Lines       21889    21901      +12     
==========================================
+ Hits        19871    19873       +2     
- Misses       2018     2028      +10     

Flag	Coverage Δ
cli-tests	39.23% <63.33%> (+<0.01%)	⬆️
gui-tests	71.75% <63.33%> (-0.04%)	⬇️
performance-tests	49.38% <63.33%> (-0.03%)	⬇️
unit-tests	79.65% <93.33%> (-0.03%)	⬇️

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[yngve-sk]

LGTM🚀