chore: Add tag-prefix for react-client-sdk release collection (#378)

The react-client-sdk repo uses prefixed release tags (e.g. launchdarkly-react-client-sdk-v3.4.0) but the metadata didn't specify a tag-prefix, so sdk-meta couldn't collect releases after 3.3.2.

In this commit, the metadata file's been updated to include the prefix.

Author: aaron-zeisler

.sdk_metadata.json

@@ -7,7 +7,10 @@
       "languages": [
         "JavaScript", "TypeScript"
       ],
-      "wrapperNames": ["react-client-sdk"]
+      "wrapperNames": ["react-client-sdk"],
+      "releases": {
+        "tag-prefix": "launchdarkly-react-client-sdk-"
+      }
     }
   }
 }