Answers SDK: add cloudChoice support

Now that cloudChoice is a param inside of search-core,
this CR adds support for setting it in the SDK, in the
init() function, including setting the old behavior as
the default. It is not needed elsewhere like with the
CLOUD_REGION setting, as that is used for things like
analytics tracking.

J=WAT-4375
TEST=auto

Ran test suite

package.json

@@ -30,7 +30,7 @@
     "@mapbox/mapbox-gl-language": "^0.10.1",
     "@yext/answers-storage": "^1.1.0",
     "@yext/rtf-converter": "^1.7.1",
-    "@yext/search-core": "^2.5.1",
+    "@yext/search-core": "^2.5.4",
     "bowser": "^2.11.0",
     "cross-fetch": "^3.1.5",
     "css-vars-ponyfill": "^2.4.3",

src/core/core.js

@@ -1,7 +1,7 @@
 /** @module Core */
 import { provideCore } from '@yext/search-core/lib/commonjs';
 // Using the ESM build for importing the Environment enum due to an issue importing the commonjs version
-import { Environment } from '@yext/search-core';
+import { CloudChoice, Environment } from '@yext/search-core';
 import { generateUUID } from './utils/uuid';
 import SearchDataTransformer from './search/searchdatatransformer';
 
@@ -120,6 +120,12 @@ export default class Core {
      */
     this._cloudRegion = CLOUD_REGION;
 
+    /**
+     * Determines the cloud choice of the api endpoints used when making search requests.
+     * @type {string}
+     */
+    this._cloudChoice = config.cloudChoice || CloudChoice.GLOBAL_MULTI;
+
     /** @type {string} */
     this._verticalKey = config.verticalKey;
 
@@ -154,6 +160,7 @@ export default class Core {
         jsLibVersion: LIB_VERSION
       },
       cloudRegion: this._cloudRegion,
+      cloudChoice: this._cloudChoice,
       environment,
       ...config
     };