Remove unused facade functions

[oyvindeide]

Issue
Resolves #my_issue

Approach
Short description of the approach

Pre review checklist

• Added appropriate release note label
• PR title captures the intent of the changes, and is fitting for release notes.
• Commit history is consistent and clean, in line with the contribution guidelines.
• Updated documentation
• Ensured new behaviour is tested

Adding labels helps the maintainers when writing release notes. This is the list of release note labels.

[codecov-commenter]

Codecov Report

Merging #5554 (8771b12) into main (ad28deb) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5554   +/-   ##
=======================================
  Coverage   76.92%   76.92%           
=======================================
  Files         394      394           
  Lines       25649    25645    -4     
  Branches     1761     1761           
=======================================
- Hits        19730    19728    -2     
+ Misses       5331     5329    -2     
  Partials      588      588           

Impacted Files	Coverage Δ
src/ert/libres_facade.py	89.70% <ø> (+0.57%)	⬆️

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