feat!: next.js 15, react 19, react compiler support

[AlessioGr]

BREAKING:

• bumps minimum required next.js version from 14.3.0-canary.68 to 15.0.0-rc.0
• bumps minimum required react and react-dom versions to 19.0.0 (19.0.0-rc-f994737d14-20240522 should be used)
• @types/react and @types/react-dom have to be bumped to npm:types-react@19.0.0-beta.2 using overrides and pnpm overrides, if you want correct types. You can find an example of this here: https://github.com/payloadcms/payload/pull/6429/files#diff-10cb9e57a77733f174ee2888587281e94c31f79e434aa3f932a8ec72fa7a5121L32

Issues

• Bunch of todos for our react-select package which is having type issues. Works fine, just type issues. Their type defs are importing JSX in a weird way, we likely just have to wait until they fix them in a future update.