Add uv lockfile

[larsevj]

See https://docs.astral.sh/uv/guides/projects/

• 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 91.69%. Comparing base (9ba5a28) to head (9b23882).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9561      +/-   ##
==========================================
- Coverage   91.90%   91.69%   -0.21%     
==========================================
  Files         433      433              
  Lines       26788    26788              
==========================================
- Hits        24619    24563      -56     
- Misses       2169     2225      +56     

Flag	Coverage Δ
cli-tests	39.76% <ø> (+0.02%)	⬆️
everest-models-test	?
gui-tests	72.13% <ø> (-0.03%)	⬇️
integration-test	37.20% <ø> (+0.03%)	⬆️
performance-tests	51.95% <ø> (+0.01%)	⬆️
test	40.69% <ø> (+0.01%)	⬆️
unit-tests	74.17% <ø> (-0.03%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #9561 will improve performances by 10.11%

_{Comparing larsevj:test_using_uv_lockfile (35d273a) with main (3f4a93e)}

Summary

⚡ 1 improvements
✅ 24 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_direct_dark_performance_with_storage[gen_x: 20, sum_x: 20 reals: 10-gen_data-get_record_observations]	1.5 ms	1.4 ms	+10.11%

[larsevj]

No dependabot support as of yet, which might be a blocker. See dependabot/dependabot-core#10478 (comment)