Replace the onboarding AI chat feature flag with an environment variable (#23439)

Follow-up to #23199.

The AI-chat onboarding is an instance-level rollout decision, not a
per-workspace experiment, so `IS_ONBOARDING_AI_CHAT_ENABLED` becomes an
instance config variable (default `false`, editable from the admin
panel) exposed to the frontend through `ClientConfig`. The workspace
feature flag is deleted; leftover `featureFlag` rows are inert since the
column is plain text.

`IS_WORKSPACE_COMPANY_ENRICHMENT_ENABLED` is removed as redundant: the
PDL client already skips everything when no API key is set. Enrichment
now runs when the AI chat is on and `PEOPLE_DATA_LABS_API_KEY` is
configured.

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packages/twenty-client-sdk/src/metadata/generated/schema.graphql

@@ -1756,7 +1756,6 @@ enum FeatureFlagKey {
   IS_JUNCTION_RELATIONS_ENABLED
   IS_REST_METADATA_API_NEW_FORMAT_DIRECT
   IS_LOGIC_FUNCTION_PREBUILT_MODE_ENABLED
-  IS_ONBOARDING_AI_CHAT_ENABLED
   IS_SETTINGS_DISCOVERY_HERO_ENABLED
   IS_WORKFLOW_VERSION_IN_CORE_ENABLED
 }
@@ -1960,6 +1959,7 @@ type ClientConfig {
   isCloudflareIntegrationEnabled: Boolean!
   isClickHouseConfigured: Boolean!
   isWorkspaceSchemaDDLLocked: Boolean!
+  isOnboardingAiChatEnabled: Boolean!
   enterpriseInstanceType: String!
   maintenance: ClientConfigMaintenanceMode
 }

packages/twenty-client-sdk/src/metadata/generated/schema.ts

@@ -1406,7 +1406,7 @@ export interface FeatureFlag {
     __typename: 'FeatureFlag'
 }
 
-export type FeatureFlagKey = 'IS_APP_CLAIMING_ENABLED' | 'IS_UNIQUE_INDEXES_ENABLED' | 'IS_JSON_FILTER_ENABLED' | 'IS_CALENDAR_WEEK_VIEW_ENABLED' | 'IS_EMAIL_GROUP_ENABLED' | 'IS_JUNCTION_RELATIONS_ENABLED' | 'IS_REST_METADATA_API_NEW_FORMAT_DIRECT' | 'IS_LOGIC_FUNCTION_PREBUILT_MODE_ENABLED' | 'IS_ONBOARDING_AI_CHAT_ENABLED' | 'IS_SETTINGS_DISCOVERY_HERO_ENABLED' | 'IS_WORKFLOW_VERSION_IN_CORE_ENABLED'
+export type FeatureFlagKey = 'IS_APP_CLAIMING_ENABLED' | 'IS_UNIQUE_INDEXES_ENABLED' | 'IS_JSON_FILTER_ENABLED' | 'IS_CALENDAR_WEEK_VIEW_ENABLED' | 'IS_EMAIL_GROUP_ENABLED' | 'IS_JUNCTION_RELATIONS_ENABLED' | 'IS_REST_METADATA_API_NEW_FORMAT_DIRECT' | 'IS_LOGIC_FUNCTION_PREBUILT_MODE_ENABLED' | 'IS_SETTINGS_DISCOVERY_HERO_ENABLED' | 'IS_WORKFLOW_VERSION_IN_CORE_ENABLED'
 
 export interface WorkspaceUrls {
     customUrl?: Scalars['String']
@@ -1608,6 +1608,7 @@ export interface ClientConfig {
     isCloudflareIntegrationEnabled: Scalars['Boolean']
     isClickHouseConfigured: Scalars['Boolean']
     isWorkspaceSchemaDDLLocked: Scalars['Boolean']
+    isOnboardingAiChatEnabled: Scalars['Boolean']
     enterpriseInstanceType: Scalars['String']
     maintenance?: ClientConfigMaintenanceMode
     __typename: 'ClientConfig'
@@ -4786,6 +4787,7 @@ export interface ClientConfigGenqlSelection{
     isCloudflareIntegrationEnabled?: boolean | number
     isClickHouseConfigured?: boolean | number
     isWorkspaceSchemaDDLLocked?: boolean | number
+    isOnboardingAiChatEnabled?: boolean | number
     enterpriseInstanceType?: boolean | number
     maintenance?: ClientConfigMaintenanceModeGenqlSelection
     __typename?: boolean | number
@@ -9416,7 +9418,6 @@ export const enumFeatureFlagKey = {
    IS_JUNCTION_RELATIONS_ENABLED: 'IS_JUNCTION_RELATIONS_ENABLED' as const,
    IS_REST_METADATA_API_NEW_FORMAT_DIRECT: 'IS_REST_METADATA_API_NEW_FORMAT_DIRECT' as const,
    IS_LOGIC_FUNCTION_PREBUILT_MODE_ENABLED: 'IS_LOGIC_FUNCTION_PREBUILT_MODE_ENABLED' as const,
-   IS_ONBOARDING_AI_CHAT_ENABLED: 'IS_ONBOARDING_AI_CHAT_ENABLED' as const,
    IS_SETTINGS_DISCOVERY_HERO_ENABLED: 'IS_SETTINGS_DISCOVERY_HERO_ENABLED' as const,
    IS_WORKFLOW_VERSION_IN_CORE_ENABLED: 'IS_WORKFLOW_VERSION_IN_CORE_ENABLED' as const
 }

packages/twenty-client-sdk/src/metadata/generated/types.ts

@@ -3802,6 +3802,9 @@ export default {
             "isWorkspaceSchemaDDLLocked": [
                 3
             ],
+            "isOnboardingAiChatEnabled": [
+                3
+            ],
             "enterpriseInstanceType": [
                 1
             ],