Run ert help without editable install

[larsevj]

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 'just rapid-tests')

When applicable

• When screenshots are changed: Review screenshot-PR in ert-testdata,
  merge screenshot-PR in ert-testdata before merging this PR.
• 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: Add backport label to latest release (format: 'backport release-branch-name')

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.90%. Comparing base (b636eea) to head (467a8ce).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14131      +/-   ##
==========================================
- Coverage   91.94%   91.90%   -0.04%     
==========================================
  Files         482      482              
  Lines       33493    33493              
==========================================
- Hits        30795    30783      -12     
- Misses       2698     2710      +12     

Flag	Coverage Δ
cli-tests	36.27% <ø> (+0.03%)	⬆️
fuzz	44.24% <ø> (ø)
gui-tests	58.47% <ø> (-0.15%)	⬇️
performance-and-unit-tests	80.67% <ø> (-0.07%)	⬇️
test	46.05% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.
see 4 files with indirect coverage changes