Fix multidrop not handling externally hosted images correctly (#447)

- Fix multidrop command not handling externally hosted images correctly
    -  It was trying to find the `https://` link in the file system, which it couldn't find
    - Fixed by copying existing logic from the drop command into the multidrop command

#442

Reviewed-on: #447
Reviewed-by: VylpesTester <tester@vylpes.com>
Co-authored-by: Ethan Lane <ethan@vylpes.com>
Co-committed-by: Ethan Lane <ethan@vylpes.com>

tests/commands/multidrop.test.ts

@@ -0,0 +1,13 @@
+describe("execute", () => {
+    describe("GIVEN randomCard image is hosted locally", () => {
+        test.todo("EXPECT image to be uploaded directly");
+    });
+
+    describe("GIVEN randomCard image is hosted via http", () => {
+        test.todo("EXPECT image link to be directly added to embed");
+    });
+
+    describe("GIVEN randomCard image is hosted via https", () => {
+        test.todo("EXPECT image link to be directly added to embed");
+    });
+});