feat(components): add test harnesses for grids, list-builder, and text-editor

[devin-ai-integration]

Summary

This PR adds Angular CDK test harnesses for three SKY UX components that were missing them:

• @skyux/grids: SkyGridHarness with methods for column/row operations (getColumnCount, getRowCount, getCellText, clickRow, etc.)
• @skyux/list-builder: SkyListHarness with basic container functionality
• @skyux/text-editor: SkyTextEditorHarness with methods for label, hint text, and state checking (isDisabled, hasErrors, isFocused, isRequired)

Each harness follows the established patterns in the codebase: extends SkyComponentHarness, implements static hostSelector and with() method, uses private locators, and includes filter interfaces.

Updates since last revision

• Added @angular/cdk as a peer dependency to grids, list-builder, and text-editor package.json files (required since harnesses import from @angular/cdk/testing)
• Ran npm run dev:update-library-dependencies to update project.json files with proper build inputs and dependencies
• CI status: The "Check dependencies and resources" check now passes. Builds and tests for grids, list-builder, and text-editor all pass. However, some unrelated CI jobs are failing:
  • manifest:build - exit code 130 (interrupted/timeout)
  • Percy visual regression tests - missing Percy tokens
  • conventional-title - missing GITHUB_TOKEN in workflow

Review & Testing Checklist for Human

• Verify the unrelated CI failures - Confirm that manifest:build failure and Percy token issues are pre-existing/infrastructure issues, not caused by this PR
• Review grid harness getCellText logic (grid-harness.ts:76-86) - Uses index calculation (rowIndex * columnCount + columnIndex) to find cells. Verify this works correctly with the actual grid DOM structure.
• Verify CSS class selectors - Text editor harness relies on classes like sky-text-editor-disabled, sky-text-editor-invalid, sky-text-editor-wrapper-focused. Confirm these match the actual component.
• Assess list-builder harness completeness - Currently minimal (only hostSelector + with method). Determine if additional methods are needed.

Recommended test plan: Manually test each harness in a consuming application to verify the methods work as expected with real component instances.

Notes

• The SkyGridHarness includes a @deprecated JSDoc tag since the underlying SkyGridComponent is deprecated
• Path mappings added to tsconfig.base.json for all three testing exports
• Tests could not be fully run locally due to Chrome browser issues in the dev environment; TypeScript compilation succeeded

Link to Devin run: https://app.devin.ai/sessions/88b9b3ffe13049679f03c3afe4fa52e3
Requested by: @bcmake

[devin-ai-integration]

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