fix(Table): Reset `columnOrder` when `columns` changes

[r100-stack]

Closes #900

When new columns array contents are passed, the old/stale columnOrder is still used. This could cause unintended column ordering as described in #900.

To fix this, this PR resets the columnOrder to [] whenever the columns array contents change.

Checklist

• [x] Add meaningful unit tests for your component (verify that all lines are covered)
• [x] Verify that all existing tests pass
• ~[ ]~ Add component features demo in Storybook (different stories)
• ~[ ]~ Approve test images for new stories
• ~[ ]~ Add screenshots of the key elements of the component

[r100-stack]

Have you tested user example with this new code? [Add user provided example to one of our test apps and see if this update helps with their issue]

Yes, I tested it by adding the code from the sandbox to the Vite Playground. I added it in the commits near https://github.com/iTwin/iTwinUI-react/pull/983/commits/a86264e3ce19956012c4f6b550b425a405a98324 and removed it after testing that it worked.