Fix SaveAwareArgResolver ignored in nested mutations

[spawnia]

Fixes a regression from #2777 (v6.69.0) where SaveAwareArgResolver::runBeforeSave() was only honoured at the top level of a mutation. One level down inside nested HasMany/HasOne/ManyToMany/BelongsTo mutations, the pre-save resolver ran AFTER the child model was already persisted — silently discarding its attribute changes.

The root cause: ResolveNested defaulted to a partitioner that unconditionally routed all resolver-bearing args into the post-save set. Only ModelMutationDirective::executeMutation() overrode this with the pre-save-aware variant; all 12 nested resolver call sites used the broken default.

The fix collapses nestedArgResolversWithoutPreSave into nestedArgResolvers so the correct behavior is the default everywhere. When root is not a Model, behavior is unchanged. When root is a Model, SaveAwareArgResolver instances with runBeforeSave=true stay in the regular set so SaveModel executes them before persisting. The now-redundant explicit partitioner in ModelMutationDirective is removed.

[Copilot]

Pull request overview

Fixes a regression where SaveAwareArgResolver::runBeforeSave() was not honored inside nested model mutations, causing pre-save arg resolvers to run after child models were already persisted.

Changes:

• Make ArgPartitioner::nestedArgResolvers() pre-save aware by default (and remove the redundant nestedArgResolversWithoutPreSave() variant).
• Remove the explicit partitioner override from ModelMutationDirective, relying on the corrected default behavior.
• Add/extend integration test coverage for pre-save custom directives inside nested relations and add latitude/longitude test fields/columns.

Reviewed changes

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

Show a summary per file

File	Description
src/Execution/Arguments/ArgPartitioner.php	Makes the default nested/regular argument partitioning honor SaveAwareArgResolver::runBeforeSave() for model roots and lifts pre-save resolvers out of @nest recursively.
src/Schema/Directives/ModelMutationDirective.php	Removes the now-unnecessary custom arg partitioner override when constructing ResolveNested.
tests/Unit/Execution/Arguments/ArgPartitionerTest.php	Updates unit tests to reflect the new default partitioning behavior and removes coverage for the deleted method.
tests/Integration/Schema/Directives/CreateDirectiveTest.php	Adds integration coverage demonstrating pre-save custom directive behavior in nested HasMany and deeper nested relations.
tests/database/migrations/2018_02_28_000003_create_testbench_tasks_table.php	Adds latitude/longitude columns to support new integration assertions.
tests/database/migrations/2018_02_28_000004_create_testbench_posts_table.php	Adds latitude/longitude columns to support deep relation integration assertions.
tests/Utils/Models/Task.php	Documents latitude/longitude properties for test model.
tests/Utils/Models/Post.php	Documents latitude/longitude properties for test model.

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