Convert AlertTable to a function component

[robertbrignull]

Final PR to convert AlertTable into a function component. See each individual commit for the individual steps.

Uses the same solution for the ScrollIntoViewHelper as we did in RawTable. And I also have a further idea for how to make it more react-y that I'll open at a later date.

From my manual testing it appears to look and behave exactly as it did before.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[charisk]

Code LGTM!