Revert "fix: 添付ファイルのあるリクエストを受けたときの初動を改善 (#15896)" (#15927)

* Revert "fix: 添付ファイルのあるリクエストを受けたときの初動を改善 (#15896)"

This reverts commit 7e8cc4d7c0.

* fix CHANGELOG.md

packages/backend/package.json

@@ -223,7 +223,6 @@
 		"@types/semver": "7.7.0",
 		"@types/simple-oauth2": "5.0.7",
 		"@types/sinonjs__fake-timers": "8.1.5",
-		"@types/supertest": "6.0.3",
 		"@types/tinycolor2": "1.4.6",
 		"@types/tmp": "0.2.6",
 		"@types/vary": "1.1.3",
@@ -240,7 +239,6 @@
 		"jest-mock": "29.7.0",
 		"nodemon": "3.1.10",
 		"pid-port": "1.0.2",
-		"simple-oauth2": "5.1.0",
-		"supertest": "7.1.0"
+		"simple-oauth2": "5.1.0"
 	}
 }