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-server/src/engine/workspace-manager/workspace-migration/workspace-migration-runner/utils/is-text-column-type.util.ts

@@ -1,11 +1,12 @@
 import { FieldMetadataType } from 'twenty-shared/types';
 
-// 'RICH_TEXT' kept as a raw string for pre-upgrade workspaces that haven't
-// yet run the 1.20 migrate-rich-text-to-text command.
+// Raw strings kept for pre-upgrade workspaces that haven't yet run
+// the 1.20 migrate-rich-text-to-text / rename-rich-text-v2 commands.
 export const isTextColumnType = (type: FieldMetadataType) => {
   return (
     type === FieldMetadataType.TEXT ||
     type === FieldMetadataType.ARRAY ||
+    (type as string) === 'RICH_TEXT_V2' ||
     (type as string) === 'RICH_TEXT'
   );
 };