Unpin polars v2

[larsevj]

Issue
Resolves #my_issue

Approach
Short description of the approach

(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 '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')

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.52%. Comparing base (127ef22) to head (9bd9179).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12627      +/-   ##
==========================================
- Coverage   90.54%   90.52%   -0.02%     
==========================================
  Files         435      435              
  Lines       30014    30018       +4     
==========================================
  Hits        27175    27175              
- Misses       2839     2843       +4     

Flag	Coverage Δ
cli-tests	37.29% <65.11%> (+0.02%)	⬆️
gui-tests	68.73% <60.46%> (+0.02%)	⬆️
performance-and-unit-tests	73.88% <100.00%> (-0.01%)	⬇️
test	38.06% <51.16%> (+<0.01%)	⬆️

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[codspeed-hq]

Merging this PR will not alter performance

✅ 22 untouched benchmarks

---

_{Comparing larsevj:update_polars_2 (9bd9179) with main (127ef22)}

[Copilot]

Pull request overview

This PR removes the upper bound constraint on the polars dependency (previously pinned to <1.35), allowing the project to use polars v2. The changes include necessary API migrations and refactoring to maintain compatibility with the newer polars version.

Changes:

• Unpinned polars version constraint in pyproject.toml (from >=1.32.3, <1.35 to >=1.32.3)
• Migrated deprecated polars APIs (map_elements to expression-based operations and map_batches)
• Vectorized distribution transform functions to handle both scalar and array inputs using numpy operations

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pyproject.toml	Removed upper bound constraint on polars dependency
uv.lock	Updated lock file with polars 1.37.1 and polars-runtime-32 1.37.1, jupyterlab 4.5.2
tests/ert/unit_tests/config/test_gen_kw_config.py	Added warning filter for expected numpy overflow warning in lognormal test
tests/ert/ui_tests/cli/test_field_parameter.py	Migrated from map_elements to expression-based polars operations (pl.when, pl.sum_horizontal, pl.max_horizontal); added column reordering logic for robust DataFrame comparison
tests/ert/ui_tests/cli/snapshots/test_field_parameter/.../enif_heat_snapshot.csv	Updated snapshot data reflecting polars v2 behavior
src/ert/storage/local_ensemble.py	Migrated map_elements to map_batches with proper Series-to-numpy conversion; improved isinstance check for numpy integers
src/ert/config/rft_config.py	Added empty array check to prevent DataFrame construction issues
src/ert/config/parameter_config.py	Updated type hints for transform_data() to support FloatOrArray
src/ert/config/gen_kw_config.py	Updated type hints and imports for FloatOrArray support
src/ert/config/distribution.py	Vectorized all transform functions to support both scalar and array inputs using numpy operations; changed from math module to numpy for consistency

[frode-aarstad]

Is this ready for review?