Fix get_number_of_existing_runpaths()

[frode-aarstad]

Issue
Resolves #8276

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 tests pass locally (after every commit!)

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

All modified and coverable lines are covered by tests ✅

Project coverage is 86.92%. Comparing base (6be9385) to head (d710c60).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8297      +/-   ##
==========================================
- Coverage   86.92%   86.92%   -0.01%     
==========================================
  Files         375      375              
  Lines       23523    23524       +1     
  Branches      624      626       +2     
==========================================
  Hits        20448    20448              
+ Misses       2999     2997       -2     
- Partials       76       79       +3     

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[dafeda]

I'm now getting: 100 out of 100 realizations are running in existing runpaths.
This look alright I think.
However, the Experiment name input is "red" indicating a duplicate experiment name, which I don't think makes sense since we are re-running in an existing experiment.
Another issue perhaps?

[frode-aarstad]

Experiment name input is "red" indicating a duplicate experiment name, which I don't think makes sense since we are re-running in an existing experiment. Another issue perhaps?

This is another issue. I will create one