Remove unused ProjectData model

Removed the ProjectData model, which was introduced during the
development of the 'Create assistant for Gerrit project' Change Set but
is no longer used.

Change-Id: I8e1d3d94e25362563181474cc32c0df42b6e819a
Signed-off-by: Patrizio <patrizio.gelosi@amarulasolutions.com>
diff --git a/src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/model/data/ProjectData.java b/src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/model/data/ProjectData.java
deleted file mode 100644
index 46b8d43..0000000
--- a/src/main/java/com/googlesource/gerrit/plugins/chatgpt/mode/stateful/model/data/ProjectData.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package com.googlesource.gerrit.plugins.chatgpt.mode.stateful.model.data;
-
-import lombok.Data;
-
-@Data
-public class ProjectData {
-    String assistantId;
-}