reverting back lines that read rabbitmq.out

[istfer]

Description

On docker, workflow writes rabbitmq.out to rundirs, but start_model_runs() try to read it from outdir, workflow hangs, further description here: #3236

Motivation and Context

Fixes #3236

Review Time Estimate

• [X] Immediately
• [ ] Within one week
• [ ] When possible

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] My name is in the list of CITATION.cff
• [ ] I have updated the CHANGELOG.md.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[mdietze]

Tagging @DongchenZ in case this affects his efforts at getting rabbitmq working