feat: add current password field to password reset (#11534)

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# Which Problems Are Solved

The password change flow in Login V2 does not ask the user to confirm
their current password before setting a new one.

# How the Problems Are Solved

- Added a "Current Password" field to the change password form
- The current password is verified via a session password check before
the new password is set
- If the current password is incorrect, the user sees a clear error
message
- Removed the previous 5-minute session freshness check, which is no
longer needed since the current password is verified inline

# Additional Changes

Added translations for the new field labels and error messages across
all supported languages

# Additional Context

- Closes #11533

---------

Co-authored-by: Max Peintner <[email protected]>

apps/login/locales/ar.json

@@ -109,14 +109,17 @@
       "description": "تعيين كلمة المرور لحسابك",
       "submit": "متابعة",
       "labels": {
+        "currentPassword": "كلمة المرور الحالية",
         "newPassword": "كلمة المرور الجديدة",
         "confirmPassword": "تأكيد كلمة المرور"
       },
       "required": {
+        "currentPassword": "عليك تقديم كلمة المرور الحالية!",
         "newPassword": "عليك تقديم كلمة مرور جديدة!",
         "confirmPassword": "هذا الحقل مطلوب"
       },
       "errors": {
+        "currentPasswordInvalid": "كلمة المرور الحالية غير صحيحة.",
         "couldNotChangePassword": "تعذر تغيير كلمة المرور",
         "couldNotVerifyPassword": "تعذر التحقق من كلمة المرور",
         "unknownError": "خطأ غير معروف"