Aldesleukin Active Not Recruiting Phase 1 Trials for Metastatic Digestive System Carcinoma / Esophageal Carcinoma / metastatic Gastric carcinoma / Pancreatic Adenocarcinoma Metastatic / Metastatic Esophageal Carcinoma / Gastrointestinal Cancer Metastatic / Colorectal Adenocarcinoma / Metastatic Cholangiocarcinoma / Stage IV Gastric Cancer AJCC v7 / Stage IVA Colorectal Cancer AJCC v7 / Stage IV Pancreatic Cancer AJCC v6 and v7 / Cholangiocarcinomas / Stage IVB Colorectal Cancer AJCC v7 / Stage IV Colorectal Cancer AJCC v7 / Metastatic Colorectal Carcinoma / Stage IV Esophageal Cancer AJCC v7 Treatment