break version-specific data into individual files (#34717)

lib/all-versions.js

@@ -139,4 +139,11 @@ export function getDocsVersion(openApiVersion) {
   return matchingVersion.version
 }
 
+export function getOpenApiVersion(version) {
+  if (!(version in allVersions)) {
+    throw new Error(`Unrecognized version '${version}'. Not found in ${Object.keys(allVersions)}`)
+  }
+  return allVersions[version].openApiVersionName
+}
+
 export { allVersions }