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/test/integration/metadata/suites/field-metadata/composite/successful-create-rich-text-field-metadata.integration-spec.ts

@@ -76,8 +76,8 @@ describe('Rich text v2 field metadata creation tests suite', () => {
     const { data } = await createOneObjectMetadata({
       expectToFail: false,
       input: {
-        nameSingular: 'testRichTextV2Object',
-        namePlural: 'testRichTextV2Objects',
+        nameSingular: 'testRichTextObject',
+        namePlural: 'testRichTextObjects',
         labelSingular: 'Test Rich Text V2 Object',
         labelPlural: 'Test Rich Text V2 Objects',
         icon: 'IconTestPipe',
@@ -124,7 +124,7 @@ describe('Rich text v2 field metadata creation tests suite', () => {
     async ({ context: { input } }) => {
       const inputPayload = {
         objectMetadataId: createdObjectMetadataId,
-        type: FieldMetadataType.RICH_TEXT_V2,
+        type: FieldMetadataType.RICH_TEXT,
         isLabelSyncedWithName: false,
         ...input,
       };

packages/twenty-server/test/integration/metadata/suites/field-metadata/composite/successful-update-rich-text-field-metadata.integration-spec.ts

@@ -76,8 +76,8 @@ describe('Rich text v2 field metadata update tests suite', () => {
     const { data } = await createOneObjectMetadata({
       expectToFail: false,
       input: {
-        nameSingular: 'testRichTextV2UpdateObject',
-        namePlural: 'testRichTextV2UpdateObjects',
+        nameSingular: 'testRichTextUpdateObject',
+        namePlural: 'testRichTextUpdateObjects',
         labelSingular: 'Test Rich Text V2 Update Object',
         labelPlural: 'Test Rich Text V2 Update Objects',
         icon: 'IconTestPipe',
@@ -109,7 +109,7 @@ describe('Rich text v2 field metadata update tests suite', () => {
       expectToFail: false,
       input: {
         objectMetadataId: createdObjectMetadataId,
-        type: FieldMetadataType.RICH_TEXT_V2,
+        type: FieldMetadataType.RICH_TEXT,
         name: 'testRichText',
         label: 'Test Rich Text',
         description: 'Initial description',