fix: filter out private repos

filtering out private repos just in case, otherwise if a user somehow
found out the name of any of the PAT owner's private -
(considering they created the PAT with private repo access) repos's name
then they could see the repo in github extra pins.

tests/fetchRepo.test.js

@@ -80,4 +80,17 @@ describe("Test fetchRepo", () => {
       "Not found"
     );
   });
+
+  it("should throw error if repository is private", async () => {
+    mock.onPost("https://api.github.com/graphql").reply(200, {
+      data: {
+        user: { repository: { ...data_repo, isPrivate: true } },
+        organization: null,
+      },
+    });
+
+    await expect(fetchRepo("anuraghazra", "convoychat")).rejects.toThrow(
+      "User Repository Not found"
+    );
+  });
 });