fix #5660 standardized relation icon (#6504)

fix #5660 

- updated One to many [1:N] icon across app
- created many to one icon [N:1] , and added it in app


![download
(2)](https://github.com/user-attachments/assets/35ce05be-0f5f-4cd0-a1b7-7ab9062f74a0)
![download
(1)](https://github.com/user-attachments/assets/57316e49-c931-4ab5-ad4b-d04b241724c3)

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-ui/src/display/icon/assets/many-to-one.svg

@@ -0,0 +1,17 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M3 5m0 2a2 2 0 0 1 2 -2h14a2 2 0 0 1 2 2v10a2 2 0 0 1 -2 2h-14a2 2 0 0 1 -2 -2z" />
+  <path d="M16 10h1v4" />
+  <path d="M7 14v-4l3 4v-4" />
+  <path d="M13 10.5l0 .01" />
+  <path d="M13 13.5l0 .01" />
+</svg>