Optimize localization memory with broadcast_to

[dafeda]

• 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 90.02%. Comparing base (1b5208a) to head (b56367e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13419      +/-   ##
==========================================
- Coverage   90.03%   90.02%   -0.02%     
==========================================
  Files         459      459              
  Lines       31986    31991       +5     
==========================================
+ Hits        28799    28800       +1     
- Misses       3187     3191       +4     

Flag	Coverage Δ
cli-tests	37.47% <55.55%> (-0.01%)	⬇️
fuzz	44.23% <0.00%> (-0.01%)	⬇️
gui-tests	66.89% <0.00%> (-0.05%)	⬇️
performance-and-unit-tests	78.03% <77.77%> (-0.02%)	⬇️
test	45.84% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/ert/analysis/_update_strategies/_distance.py	76.47% <100.00%> (+1.47%)	⬆️

... and 1 file with indirect coverage changes

[codspeed-hq]

Merging this PR will not alter performance

✅ 36 untouched benchmarks

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_{Comparing dafeda:broadcast-to-memory (b56367e) with main (1b5208a)}

[larsevj]

Is it worth it to have the two separate branches here?