Rename reflex UI and reflex UI shared

[adhami3310]

i'm planning to make those published on pypi, which means we have to give them an actual name

[codspeed-hq]

Merging this PR will not alter performance

✅ 9 untouched benchmarks

---

_{Comparing rename-reflex-ui-and-reflex-ui-shared (fac9fd1) with main (0042801)}