build(docs-infra): ivy prebuild script should not run ngcc for all formats (angular#29117)

Currently when building AIO with Ivy, we run Ngcc and transform
all found formats. This potentially slows down the build (and
therefore the "test_aio_local_ivy" job). Since it's not necessary
to build all formats, and we only need "fesm5" and "fesm2015",
we can explicitly specify the required formats.

**Note**: Currently this does not have any big effect, because Angular
Material does not ship ES2015/ES5 files. The change primarily just
suppresses the Ngcc messages for Material not providing ES2015/ES5
entry-points.

Technically if new non-Ivy packages are added to AIO, this
speeds up the build as we don't build the unused formats.

PR Close angular#29117

Author: devversion

aio/package.json

@@ -17,7 +17,7 @@
     "build": "yarn ~~build",
     "prebuild-local": "yarn setup-local",
     "build-local": "yarn ~~build",
-    "prebuild-with-ivy": "yarn setup-local && yarn ivy-ngcc",
+    "prebuild-with-ivy": "yarn setup-local && yarn ivy-ngcc --formats fesm2015 fesm5",
     "build-with-ivy": "node scripts/build-with-ivy",
     "extract-cli-command-docs": "node tools/transforms/cli-docs-package/extract-cli-commands.js 3b1fe6437",
     "lint": "yarn check-env && yarn docs-lint && ng lint && yarn example-lint && yarn tools-lint",