ingest: Fixed left over rename to 'ingest-user-plugin'

Closes #19307

plugins/ingest-user-agent/src/main/java/org/elasticsearch/ingest/useragent/IngestUserAgentPlugin.java

@@ -50,7 +50,7 @@ public class IngestUserAgentPlugin extends Plugin implements IngestPlugin {
     @Override
     public Map<String, Processor.Factory> getProcessors(
         Environment env, ScriptService scriptService, TemplateService templateService) {
-        Path userAgentConfigDirectory = env.configFile().resolve("ingest-useragent");
+        Path userAgentConfigDirectory = env.configFile().resolve("ingest-user-agent");
 
         if (Files.exists(userAgentConfigDirectory) == false && Files.isDirectory(userAgentConfigDirectory)) {
             throw new IllegalStateException(

plugins/ingest-user-agent/src/test/resources/rest-api-spec/test/ingest-useragent/30_custom_regex.yaml

@@ -1,8 +1,5 @@
 ---
 "Test user agent processor with custom regex file":
-  - skip:
-      version: "all"
-      reason: "awaits fix #19307"
   - do:
       ingest.put_pipeline:
         id: "my_pipeline"