feat: rename RICH_TEXT_V2 → RICH_TEXT in codebase (keep DB value) (#18628)

## Summary

- Renames the `FieldMetadataType` enum key from `RICH_TEXT_V2` to
`RICH_TEXT` across the entire codebase, while keeping the underlying
string value as `'RICH_TEXT_V2'` to maintain PostgreSQL database
compatibility
- Renames all related types, guards, hooks, components, and files from
`*RichTextV2*` / `*rich-text-v2*` to `*RichText*` / `*rich-text*` (e.g.
`FormRichTextV2FieldInput` → `FormRichTextFieldInput`,
`isFieldRichTextV2` → `isFieldRichText`)
- Updates generated files (GraphQL schema, SDK types) to use the new key
while preserving the `RICH_TEXT_V2` string value for DB/API layer
- Updates i18n locale files, test snapshots, and integration tests to
reflect the rename

## Context

The legacy `RICH_TEXT` (V1) field type was deprecated and migrated to
`TEXT` in a previous PR (#18623). With V1 gone, the `RICH_TEXT_V2`
naming is no longer necessary — `RICH_TEXT` is now the canonical name.
The DB enum value stays `'RICH_TEXT_V2'` to avoid confusion with the
just-deprecated V1 type and to prevent a database migration.

## Test plan

- [x] `twenty-server` typecheck passes
- [x] `twenty-front` typecheck passes (only pre-existing Apollo client
errors remain)
- [x] `twenty-server` lint passes
- [x] `twenty-front` lint passes
- [x] `twenty-shared` build passes
- [ ] CI passes


Made with [Cursor](https://cursor.com)

packages/twenty-front/src/modules/object-metadata/utils/__tests__/filterSortableFieldMetadataItems.test.ts

@@ -96,12 +96,12 @@ describe('filterSortableFieldMetadataItems', () => {
     expect(filterSortableFieldMetadataItems(field)).toBe(false);
   });
 
-  it('should NOT allow unsortable field types like RICH_TEXT_V2', () => {
+  it('should NOT allow unsortable field types like RICH_TEXT', () => {
     const field = {
-      type: FieldMetadataType.RICH_TEXT_V2,
+      type: FieldMetadataType.RICH_TEXT,
       isSystem: false,
       isActive: true,
-      name: 'richTextV2',
+      name: 'richText',
     };
 
     expect(filterSortableFieldMetadataItems(field)).toBe(false);

packages/twenty-front/src/modules/object-metadata/utils/mapFieldMetadataToGraphQLQuery.ts

@@ -310,7 +310,7 @@ ${mapObjectMetadataToGraphQLQuery({
     }`;
   }
 
-  if (fieldType === FieldMetadataType.RICH_TEXT_V2) {
+  if (fieldType === FieldMetadataType.RICH_TEXT) {
     return `${gqlField}
 {
   blocknote