fix: Files field fix (#7376)

## Description

Closes #7324 
Closes #7323

- This PR solves the issue - 
- #7324 
- #7323
- On Enter the rename of the file is saved
- Removed renaming of extension

## After Changes Behaviour


https://github.com/user-attachments/assets/f5c47cd4-883e-473e-9cfa-e277f8f630c2

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/utils/file/getFileNameAndExtension.ts

@@ -0,0 +1,8 @@
+export const getFileNameAndExtension = (filenameWithExtension: string) => {
+  const lastDotIndex = filenameWithExtension.lastIndexOf('.');
+
+  return {
+    name: filenameWithExtension.substring(0, lastDotIndex),
+    extension: filenameWithExtension.substring(lastDotIndex),
+  };
+};