Update sheets.py

sheets.py

@@ -163,6 +163,7 @@ def create_candidate(
     ft_slack_id: str,
     hr_slack_id: str,
     week0_start_date: str,
+    stage: str = "week0",
 ) -> dict:
     ws = get_sheet(SHEET_CANDIDATES)
     candidate_id = _gen_id("CAND")
@@ -170,7 +171,7 @@ def create_candidate(
         candidate_id,
         slack_user_id,
         name,
-        "week0",           # stage
+        stage,             # stage
         cohort_id,
         ft_slack_id,
         hr_slack_id,