update download-artifact tests for public and internal impl

__tests__/common.ts

@@ -0,0 +1,9 @@
+import * as core from '@actions/core'
+
+// noopLogs mocks the console.log and core.* functions to prevent output in the console while testing
+export const noopLogs = (): void => {
+  jest.spyOn(console, 'log').mockImplementation(() => {})
+  jest.spyOn(core, 'debug').mockImplementation(() => {})
+  jest.spyOn(core, 'info').mockImplementation(() => {})
+  jest.spyOn(core, 'warning').mockImplementation(() => {})
+}