remove IMAP_SMTP_CALDAV feature flag (#16695)

To be merged after 
https://github.com/twentyhq/twenty/pull/16479
https://github.com/twentyhq/twenty/pull/16694

packages/twenty-server/src/engine/core-modules/feature-flag/constants/public-feature-flag.const.ts

@@ -12,16 +12,6 @@ export type PublicFeatureFlag = {
 };
 
 export const PUBLIC_FEATURE_FLAGS: PublicFeatureFlag[] = [
-  {
-    key: FeatureFlagKey.IS_IMAP_SMTP_CALDAV_ENABLED,
-    metadata: {
-      label: 'IMAP, SMTP, CalDAV',
-      description:
-        'Easily add email accounts from any provider that supports IMAP, send emails with SMTP (and soon, sync calendars with CalDAV)',
-      imagePath:
-        'https://twenty.com/images/lab/is-imap-smtp-caldav-enabled.png',
-    },
-  },
   {
     key: FeatureFlagKey.IS_PAGE_LAYOUT_ENABLED,
     metadata: {

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -6,7 +6,6 @@ export enum FeatureFlagKey {
   IS_JSON_FILTER_ENABLED = 'IS_JSON_FILTER_ENABLED',
   IS_AI_ENABLED = 'IS_AI_ENABLED',
   IS_APPLICATION_ENABLED = 'IS_APPLICATION_ENABLED',
-  IS_IMAP_SMTP_CALDAV_ENABLED = 'IS_IMAP_SMTP_CALDAV_ENABLED',
   IS_PAGE_LAYOUT_ENABLED = 'IS_PAGE_LAYOUT_ENABLED',
   IS_RECORD_PAGE_LAYOUT_ENABLED = 'IS_RECORD_PAGE_LAYOUT_ENABLED',
   IS_PUBLIC_DOMAIN_ENABLED = 'IS_PUBLIC_DOMAIN_ENABLED',