refactor: migrate protected branch fields into one json column and support system users (#39735)

1. migrate protected branch fields into one json column
2. use the dropdown list for push/force-push user selection, and Actions
user can be added into the list now.

models/issues/assignees.go

@@ -188,5 +188,5 @@ func MakeIDsFromAPIAssigneesToAdd(ctx context.Context, oneAssignee string, multi
 	}
 
 	// Get the IDs of all assignees
-	return user_model.GetUserIDsByNames(ctx, requestAssignees, false)
+	return user_model.GetDoerUserIDsByNames(ctx, requestAssignees)
 }

models/issues/review_test.go

@@ -433,7 +433,7 @@ func TestRecalculateReviewsOfficial(t *testing.T) {
 
 	// Once the reviewer is whitelisted, re-evaluating restores the official flag.
 	rule.ApprovalsWhitelistUserIDs = []int64{2, reviewer.ID}
-	_, err = db.GetEngine(t.Context()).ID(rule.ID).Cols("approvals_whitelist_user_i_ds").Update(rule)
+	_, err = db.GetEngine(t.Context()).ID(rule.ID).Cols("config").Update(rule)
 	assert.NoError(t, err)
 
 	assert.NoError(t, issues_model.RecalculateReviewsOfficial(t.Context(), issue))