fix: Do not publish the protos to npm (#8079)

## Description

This change solves https://togithub.com/googleapis/librarian/issues/4820 and ensures that the .proto files don't get published to npm.

## Impact

This just cleans up the built packages. It will make customer dependencies smaller which could improve the performance of their applications by shrinking their node_modules folders.

## Testing

Only package.json files are modified in this change so tests against the source code aren't really required here.

Author: danieljbruce

packages/google-ads-admanager/package.json

@@ -11,8 +11,7 @@
   "author": "Google LLC",
   "main": "build/src/index.js",
   "files": [
-    "build/src",
-    "build/protos"
+    "build/src"
   ],
   "homepage": "https://github.com/googleapis/google-cloud-node/tree/main/packages/google-ads-admanager",
   "keywords": [

packages/google-ads-datamanager/package.json

@@ -11,8 +11,7 @@
   "author": "Google LLC",
   "main": "build/src/index.js",
   "files": [
-    "build/src",
-    "build/protos"
+    "build/src"
   ],
   "homepage": "https://github.com/googleapis/google-cloud-node/tree/main/packages/google-ads-datamanager",
   "keywords": [

packages/google-ai-generativelanguage/package.json

@@ -11,8 +11,7 @@
   "author": "Google LLC",
   "main": "build/src/index.js",
   "files": [
-    "build/src",
-    "build/protos"
+    "build/src"
   ],
   "homepage": "https://github.com/googleapis/google-cloud-node/tree/main/packages/google-ai-generativelanguage",
   "keywords": [

packages/google-analytics-admin/package.json

@@ -12,7 +12,6 @@
   "main": "build/src/index.js",
   "files": [
     "build/src",
-    "build/protos",
     "!build/src/**/*.map"
   ],
   "keywords": [

packages/google-analytics-data/package.json

@@ -12,7 +12,6 @@
   "main": "build/src/index.js",
   "files": [
     "build/src",
-    "build/protos",
     "!build/src/**/*.map"
   ],
   "keywords": [

packages/google-api-apikeys/package.json

@@ -13,7 +13,6 @@
   "main": "build/src/index.js",
   "files": [
     "build/src",
-    "build/protos",
     "!build/src/**/*.map"
   ],
   "keywords": [

packages/google-api-cloudquotas/package.json

@@ -11,8 +11,7 @@
   "author": "Google LLC",
   "main": "build/src/index.js",
   "files": [
-    "build/src",
-    "build/protos"
+    "build/src"
   ],
   "homepage": "https://github.com/googleapis/google-cloud-node/tree/main/packages/google-api-cloudquotas",
   "keywords": [

packages/google-api-servicecontrol/package.json

@@ -12,7 +12,6 @@
   "main": "build/src/index.js",
   "files": [
     "build/src",
-    "build/protos",
     "!build/src/**/*.map"
   ],
   "keywords": [

packages/google-api-servicemanagement/package.json

@@ -12,7 +12,6 @@
   "main": "build/src/index.js",
   "files": [
     "build/src",
-    "build/protos",
     "!build/src/**/*.map"
   ],
   "keywords": [

packages/google-api-serviceusage/package.json

@@ -12,7 +12,6 @@
   "main": "build/src/index.js",
   "files": [
     "build/src",
-    "build/protos",
     "!build/src/**/*.map"
   ],
   "keywords": [