update(ui-grid-header-cell): enable sorting on grid header cell for enter & space-bar keys #7040
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Issue Description: User is unable to perform sorting actions using keyboard keys on Grid Column Header cell. We have to enable Column Header Menu to perform sorting through Menu option.
Proposed Fix: Updated handleKeyDown method to perform sorting on Enter and Spacebar keys in ui-grid-header-cell.js file.
After Changes :

AfterChanges_SortingWithKeyBoard.zip
Testing Details: (Verified Locally)

Unit tests - PASS
Manual testing - PASS
E2E testing - PASS
Note: CI build seems to be broken.