Move workflow_runner and add top-level exports for semeio & everest

[eivindjahren]

Used for equinor/everest#44 and equinor/semeio#626

• 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

[yngve-sk]

LGTM

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.31250% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.85%. Comparing base (2ce2080) to head (7ca6dc2).

Files	Patch %	Lines
src/ert/ensemble_evaluator/_ensemble.py	88.88%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8254      +/-   ##
==========================================
- Coverage   86.86%   86.85%   -0.01%     
==========================================
  Files         378      378              
  Lines       23946    23948       +2     
  Branches      631      623       -8     
==========================================
+ Hits        20800    20801       +1     
+ Misses       3067     3066       -1     
- Partials       79       81       +2     

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