Prepend hydrate event when connecting

[masenf]

Avoid backend on_mount events triggering a reload message, which ends up requeuing hydrate event.

import reflex as rx


class State(rx.State):
    def fooooooo(self):
        print("Foooo!")

    def on_load(self):
        print("on_load scrode")


def index() -> rx.Component:
    return rx.box("Hola Mundo", on_mount=[State.fooooooo, State.fooooooo, State.fooooooo])


app = rx.App()
app.add_page(index, on_load=State.on_load)

Before the fix, this code triggers on_load four times 🫨

[codspeed-hq]

CodSpeed Performance Report

Merging #4929 will not alter performance

_{Comparing masenf/fix-reload-on-mount (0c63a86) with main (5c8104f)}

Summary

✅ 12 untouched benchmarks

[benedikt-bartscher]

Before the fix, this code triggers on_load four times 🫨

...and after it only once, awesome!