ArrayStore - onPush TypeScript type does not match actual return value (T1316896)

[ajivanyandev]

No description provided.

[Copilot]

Pull request overview

This PR fixes a TypeScript type mismatch in the ArrayStore.onPush callback and Store.push() method. Previously, onPush was incorrectly typed to receive Array<TItem> when it actually receives an array of change objects. The fix introduces a new StoreChange<TItem, TKey> type and updates both the onPush callback signature and the push method signature to use this type.

Key changes:

• Introduced StoreChange<TItem, TKey> type to describe push change objects with properties: type, data, key, and index
• Updated Store.push() method signature to accept Array<StoreChange<TItem, TKey>> instead of inline type definition
• Corrected StoreOptions.onPush callback parameter type from Array<TItem> to Array<StoreChange<TItem, TKey>>

Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/devextreme/ts/dx.all.d.ts	Adds StoreChange type definition and updates Store.push() and StoreOptions.onPush to use it
packages/devextreme/js/data/store.d.ts	Adds StoreChange type definition and updates Store.push() and StoreOptions.onPush signatures, includes JSDoc annotation for the correct parameter type
e2e/compilation-cases/T1316896.ts	Adds compilation test case that verifies the type fix works correctly with ArrayStore