Measure bundlesize using @apollo/client root package again.

Analogous to 2c0088f, but cherry-picked
from `main` to `release-3.5`.

Though this increases the bundlesize by +2.7kB (reflecting the weight of
`@apollo/client/react`), the same calculation on `main` gives 28.35kB,
whereas `release-3.5` now gives 27.62kB, reflecting the massive savings
from @brainkim's React refactorings in #8596.

config/rollup.config.js

@@ -127,16 +127,7 @@ export default [
     './dist/index.js',
     './dist/apollo-client.cjs',
   ),
-  // The bundlesize check configured in package.json reflects the total size of
-  // @apollo/client/core (note the /core), rather than @apollo/client, which
-  // currently includes React-related exports that may not be used by all
-  // consumers. We are planning to confine those React exports to
-  // @apollo/client/react in AC4 (see issue #8190).
-  prepareCJS(
-    './dist/core/index.js',
-    './temp/bundlesize.cjs',
-  ),
   prepareCJSMinified(
-    './temp/bundlesize.cjs',
+    './dist/apollo-client.cjs',
   ),
 ];

package.json

@@ -54,8 +54,8 @@
   "bundlesize": [
     {
       "name": "apollo-client",
-      "path": "./temp/bundlesize.min.cjs",
-      "maxSize": "25 kB"
+      "path": "./dist/apollo-client.min.cjs",
+      "maxSize": "27.7 kB"
     }
   ],
   "engines": {