Remove rowSelectionMode

[kmcginnes]

Description

This rowSelectionMode was never checkbox, so I'm removing the option to reduce custom code around the table view.

Validation

• Smoke test

Related Issues

• Part of Update to latest version of Tanstack Table #1279

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.