Migrate `rx.moment` to react-moment 2.x (prop restructure + new peer dep)

[masenf]

react-moment 2.0.0 is a breaking major that reflex-components-moment cannot take as a straight version bump. The pin is currently held at react-moment@1.2.2, and react-moment is filtered out of the release branch's outdated-dependency check with a pointer to this issue's problem.

Why it's blocked

The 2.0 release reworks the component's public surface:

• global configuration moved into a settings prop on the Moment component rather than module-level config
• the component's props were restructured
• the singular filter prop was removed
• a new peer dependency, moment-duration-format ^2.2.2, joins moment and react

Moment in packages/reflex-components-moment/src/reflex_components_moment/moment.py declares roughly two dozen props one-to-one against the 1.x API (interval, format, trim, parse, add/subtract via MomentDelta, from_now, from_now_short, from_now_during, to_now, with_title, title_format, diff, decimal, unit, duration, duration_from_now, unix, local, tz, locale, on_change). Each needs checking against the 2.x prop layout, and any that moved or disappeared needs a deprecation path since rx.moment is public API.

What needs doing

• Diff the 1.x → 2.x prop surface against the props declared on Moment and write up the mapping (upstream's 2.0.0 migration guide is the reference)
• Deprecate or rename any prop that moved, per the project's deprecation policy (console.deprecate() with a deprecation_version of the next dot version, removal_version of the next major)
• Add moment-duration-format to lib_dependencies so the new peer dep resolves
• Bump the react-moment pin to 2.x and regenerate .pyi stubs
• Add an integration test covering the props that changed, and a news fragment under packages/reflex-components-moment/news/
• Drop react-moment from the frontend ignore list in .github/workflows/check_outdated_dependencies.yml

Notes

moment-timezone was already bumped to 0.6.3 separately; it is unaffected by this migration. react-moment 2.0.2 was published 2026-05-26, so there is no urgency from a freshness standpoint — this is purely about doing the prop migration properly.

Upstream changelog: https://github.com/headzoo/react-moment/blob/master/CHANGELOG.md

[linear-code]

ENG-11848