Activity as standard object (#6219)

In this PR I layout the first steps to migrate Activity to a traditional
Standard objects

Since this is a big transition, I'd rather split it into several
deployments / PRs

<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/012e2bbf-9d1b-4723-aaf6-269ef588b050">

---------

Co-authored-by: Charles Bochet <charles@twenty.com>
Co-authored-by: bosiraphael <71827178+bosiraphael@users.noreply.github.com>
Co-authored-by: Weiko <corentin@twenty.com>
Co-authored-by: Faisal-imtiyaz123 <142205282+Faisal-imtiyaz123@users.noreply.github.com>
Co-authored-by: Prateek Jain <prateekj1171998@gmail.com>

packages/twenty-front/src/pages/settings/data-model/SettingsObjectNewField/SettingsObjectNewFieldStep2.tsx

@@ -161,13 +161,9 @@ export const SettingsObjectNewFieldStep2 = () => {
 
   const excludedFieldTypes: SettingsSupportedFieldType[] = (
     [
-      // FieldMetadataType.Email,
-      // FieldMetadataType.FullName,
       FieldMetadataType.Link,
       FieldMetadataType.Numeric,
-      // FieldMetadataType.Probability,
-      // FieldMetadataType.Uuid,
-      // FieldMetadataType.Phone,
+      FieldMetadataType.RichText,
     ] as const
   ).filter(isDefined);