Clean up .gitignore and remove tracked target files

Co-authored-by: phrocker <[email protected]>

Author: Copilot

.gitignore

@@ -30,28 +30,8 @@ replay_pid*
 *.jar
 *.war
 *.ear
-target/*
-api/target/**
-core/target/**
-java-agent/target/**
-core/target/
-java-agent/target/
-ai-agent/target/**
-ai-agent/target/
-analytics/target/**
-analytics/target/
-dataplane/target/**
-dataplane/target/
-llm-proxy/target/**
-llm-proxy/target/
-llm-dataplane/target/**
-llm-dataplane/target/**
-llm-core/target/**
-provenance-core/target/**
-provenance-ingestor/target/**
-llm-dataplane/target/
-llm-dataplane/target/
-llm-core/target/
+target/
+**/target/
 node/*
 node_modules/*
 api/node_modules/*