Scheduler: Multilevel grouping — Fix aria-required-parent in vertical group panel

[aleksei-semikozov]

No description provided.

[Copilot]

Pull request overview

Fixes an accessibility issue in the Scheduler’s vertical group panel (multilevel grouping) by removing an ARIA role that triggers aria-required-parent violations, and expands automated a11y coverage for grouped Scheduler configurations.

Changes:

• Removed role="rowheader" from the vertical group panel node cell to avoid invalid ARIA role hierarchy.
• Updated Jest unit tests to reflect the removed role and explicitly assert it is not present.
• Added TestCafe a11y (axe) coverage for grouped Scheduler scenarios across multiple views/orientations, including hierarchical resources.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/devextreme/js/__internal/scheduler/r1/components/base/group_panel_vertical_node.tsx	Removes invalid rowheader role from group panel cell markup to address axe aria-required-parent.
packages/devextreme/js/__internal/scheduler/r1/components/base/group_panel_vertical_node.test.tsx	Aligns unit expectations with the updated markup and adds an explicit assertion that role is not set.
e2e/testcafe-devextreme/tests/accessibility/scheduler/scheduler.ts	Adds axe checks for Scheduler grouping scenarios across multiple views/orientations and resource hierarchies.