fix: Disable fastRefresh in shared Rsbuild configuration

In our projects, we found that using
`rsbuild build --watch --mode development` instead of just
`rsbuild build --watch` would speed up the re-build process

But when doing so, the bundler enables the
[fastRefresh](https://rsbuild.dev/plugins/list/plugin-react#fastrefresh)
mode from plugin-react

This mode does not work on `build` mode and trying to run the cozy-apps
would produce a blank screen with some `$RefreshSig$ is not defined`

This is because fastRefresh is meant to be run with `rsbuild dev`
command

So we want to disable this mode for all commands but `rsbuild dev`

config/rsbuild-config-cozy-app/getRsbuildConfig.js

@@ -31,7 +31,9 @@ function getRsbuildConfig({
     plugins: [
       pluginEjs(),
       pluginNodePolyfill(),
-      pluginReact(),
+      pluginReact({
+        fastRefresh: import.meta.env.NODE_ENV === 'development'
+      }),
       pluginStylus({
         stylusOptions: {
           // To resolve import from cozy-ui inside stylus files