Move twenty-client-sdk to dev dep (#21611)

# Introduction
The `twenty-client-sdk` is always provided and injected at runtime by
the twenty-server instance
Which mean that even if in your app locally you're using
twenty-client-sdk `1.0` installing this app on twenty instance `2.0`
will result in injecting another `twenty-client-sdk`

That's the expected behavior and tradeof

The twenty-app devdep should only be used to guide local devxp following
typesafety and so on

A user can still locally generated its own twenty-client-sdk and publish
it if necessary

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packages/twenty-docs/developers/extend/apps/getting-started/troubleshooting.mdx

@@ -9,5 +9,6 @@ icon: "wrench"
 - **Yarn 4 missing** — Run `corepack enable`.
 - **Dependencies broken** — `rm -rf node_modules && yarn install`.
 - **`twenty-sdk` errors after upgrading to v2.8.0** — It moved from `dependencies` to `devDependencies` in v2.8.0. See [Project Structure → Dependencies](/developers/extend/apps/getting-started/project-structure#dependencies).
+- **`twenty build` warns about `twenty-client-sdk` under `dependencies`** — It is provided at runtime by Twenty, so it should be moved to `devDependencies` alongside `twenty-sdk`. See [Project Structure → Dependencies](/developers/extend/apps/getting-started/project-structure#dependencies).
 
 Stuck? Ask on the [Twenty Discord](https://discord.com/channels/1130383047699738754/1130386664812982322).