Clean up search-common/search-backend-node APIs, indicating beta.

Signed-off-by: Eric Peterson <ericpeterson@spotify.com>

scripts/api-extractor.ts

@@ -213,6 +213,7 @@ const NO_WARNING_PACKAGES = [
   'packages/errors',
   'packages/integration',
   'packages/integration-react',
+  'packages/search-common',
   'packages/techdocs-common',
   'packages/test-utils',
   'packages/theme',
@@ -235,6 +236,7 @@ const NO_WARNING_PACKAGES = [
   'plugins/scaffolder-backend-module-rails',
   'plugins/scaffolder-backend-module-yeoman',
   'plugins/scaffolder-common',
+  'plugins/search-backend-node',
   'plugins/techdocs-backend',
   'plugins/tech-insights',
   'plugins/tech-insights-backend',