Use f-strings for formatting

[berland]

This commit only consists of the safe fixes that ruff can do

Issue
Resolves ruff issue UP032

Approach
ruff check --fix

• 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 91.86%. Comparing base (6ce4714) to head (d7723ba).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9570   +/-   ##
=======================================
  Coverage   91.85%   91.86%           
=======================================
  Files         433      433           
  Lines       26773    26773           
=======================================
+ Hits        24592    24594    +2     
+ Misses       2181     2179    -2     

Flag	Coverage Δ
cli-tests	39.75% <ø> (ø)
everest-models-test	34.58% <0.00%> (+<0.01%)	⬆️
gui-tests	72.15% <ø> (+0.02%)	⬆️
integration-test	37.21% <100.00%> (+0.01%)	⬆️
performance-tests	51.95% <ø> (ø)
test	40.46% <100.00%> (ø)
unit-tests	74.19% <0.00%> (+<0.01%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #9570 will not alter performance

_{Comparing berland:f-strings (d7723ba) with main (6ce4714)}

Summary

✅ 22 untouched benchmarks

[eivindjahren]

📏