Move to ZarrTestBuilder

[ppinchuk]

Moved all the tests I could find that were creating a Zarr file for testing to use ZarrTestBuilder. Deprecated the old functions and approach in favor of this cleaner setup. Thanks @castelao!!

[Copilot]

Pull request overview

This PR refactors Rust-side test dataset creation to consistently use dataset::samples::ZarrTestBuilder, replacing older ad-hoc Zarr construction helpers and updating dependent tests to the new APIs (including an explicit band dimension).

Changes:

• Updated ZarrTestBuilder to model 3D arrays (band, y, x) and expanded helper constructors accordingly.
• Migrated multiple tests to use ZarrTestBuilder / new samples::*_zarr(...) helpers instead of the removed legacy builders.
• Adjusted dataset and lazy-subset tests to use 3D ArraySubset ranges and validate 3D shapes.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
crates/revrt/src/routing/features/samples.rs	Updates sample docs to reference the new random multi-variable helper.
crates/revrt/src/lib.rs	Migrates routing tests to the new samples helpers and builder-based dataset creation.
crates/revrt/src/dataset/samples.rs	Extends ZarrTestBuilder to include band dimension + new helpers; removes legacy builders.
crates/revrt/src/dataset/mod.rs	Updates dataset tests to use builder-based Zarr fixtures and new helper signatures.
crates/revrt/src/dataset/lazy_subset.rs	Updates async lazy-subset tests for 3D (band, y, x) subsets and shapes.
crates/revrt/src/cost.rs	Updates cost tests to build Zarr fixtures via ZarrTestBuilder.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.34%. Comparing base (4dfff67) to head (8b82867).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #243   +/-   ##
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  Coverage   99.34%   99.34%           
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  Files          25       25           
  Lines        2765     2765           
  Branches      320      320           
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  Hits         2747     2747           
  Misses          9        9           
  Partials        9        9           

Flag	Coverage Δ
unittests	99.34% <ø> (ø)

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