Add select_wells forward model to everest documentation

[DanSava]

Issue
Resolves #8810

For now if we want these changes to be available on fmu-docs equinor/everest#146 needs to be merged

(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 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

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 91.38%. Comparing base (e92f558) to head (0d8e9cc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8834   +/-   ##
=======================================
  Coverage   91.38%   91.38%           
=======================================
  Files         342      342           
  Lines       21028    21028           
=======================================
  Hits        19216    19216           
  Misses       1812     1812           

Flag	Coverage Δ
cli-tests	39.61% <ø> (+<0.01%)	⬆️
gui-tests	73.55% <ø> (ø)
performance-tests	50.10% <ø> (+0.04%)	⬆️
unit-tests	79.82% <ø> (ø)

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