Refactor: Github Service (#6580)

Co-authored-by: Engel Nyst <enyst@users.noreply.github.com>

openhands/server/data_models/gh_types.py

@@ -0,0 +1,17 @@
+from pydantic import BaseModel
+
+
+class GitHubUser(BaseModel):
+    id: int
+    login: str
+    avatar_url: str
+    company: str | None = None
+    name: str | None = None
+    email: str | None = None
+
+
+class GitHubRepository(BaseModel):
+    id: int
+    full_name: str
+    stargazers_count: int | None = None
+    link_header: str | None = None