Clean up bundlesize config

This follows up the parent change, where I think I misunderstood the
bundlesize configs. The configs in bundlesize.config.json and
package.json are separate, and the latter became unused by kicking out
npm bundlesize; but I think that can be addressed by merging it into the
former. The size has to be a bit larger to pass CI – I assume because it
now includes styles, messages, and types.json as well.

Bug: T382192
Bug: T360590
Change-Id: I91dcf50e3ea7d4dcb68189b63a1a0d60368dccf9

bundlesize.config.json

@@ -2,5 +2,9 @@
 	{
 		"resourceModule": "ext.popups",
 		"maxSize": "0.4 kB"
+	},
+	{
+		"resourceModule": "ext.popups.main",
+		"maxSize": "20.0 kB"
 	}
 ]

package.json

@@ -65,11 +65,5 @@
 		"wdio-mediawiki": "2.3.0",
 		"webpack": "5.89.0",
 		"webpack-cli": "5.1.4"
-	},
-	"bundlesize": [
-		{
-			"path": "resources/dist/index.js",
-			"maxSize": "13.5kB"
-		}
-	]
+	}
 }