Add post-build artifacts generated manually

Author: Ruinong Tian

build_artifacts/v2/v2.7/v2.7.2/CHANGELOG-cpu.md

@@ -0,0 +1,7 @@
+# Change log: 2.7.2(cpu)
+
+## Upgrades: 
+
+Package | Previous Version | Current Version
+---|---|---
+sagemaker-code-editor|1.5.0|1.5.1

build_artifacts/v2/v2.7/v2.7.2/CHANGELOG-gpu.md

@@ -0,0 +1,7 @@
+# Change log: 2.7.2(gpu)
+
+## Upgrades: 
+
+Package | Previous Version | Current Version
+---|---|---
+sagemaker-code-editor|1.5.0|1.5.1