Fix color to ensemble sort order

[HakonSohoel]

Issue
Intended to solve #11829, but abandoned

Approach
Added logic to fix plot color to ensemble order, including unselected ensembles.

• 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 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')

[codspeed-hq]

CodSpeed Performance Report

Merging #11887 will not alter performance

_{Comparing HakonSohoel:Fix-plot-color-to-order (92cb232) with main (71fe688)}

Summary

✅ 22 untouched

[HakonSohoel]

Abandoned this option. Found a more elegant solution with PR #12036