Bump FluentUI in quarto-preview webui and rebuild the bundle (#15184)

Update @fluentui/react-components from ~9.48.0 to ~9.74.9 and
@fluentui/react-icons from ^2.0.302 to ^2.0.343. Both were proposed by
Snyk in #15181 and #15182, which edit the same package.json and
lockfile, so they are combined here and those PRs are closed.

Snyk does not rebuild the committed
src/webui/quarto-preview/dist/quarto-preview.js, so the bundle is
regenerated here. Without that, runtime-boundary fails on a dirty tree
after configure rebuilds the webui.

Related to #15181, #15182

Author: cderv