feat(workspace): add support for custom domain status toggle (#10114)

Introduce isCustomDomainEnabled field in Workspace entity to manage
custom domain activation. Update related services, types, and logic to
validate and toggle the custom domain's status dynamically based on its
current state. This ensures accurate domain configurations are reflected
across the system.

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

packages/twenty-server/src/engine/core-modules/environment/environment-variables.ts

@@ -820,6 +820,14 @@ export class EnvironmentVariables {
   @ValidateIf((env) => env.CLOUDFLARE_API_KEY)
   CLOUDFLARE_ZONE_ID: string;
 
+  @EnvironmentVariablesMetadata({
+    group: EnvironmentVariablesGroup.Other,
+    description: 'Random string to validate queries from Cloudflare',
+  })
+  @IsString()
+  @IsOptional()
+  CLOUDFLARE_WEBHOOK_SECRET: string;
+
   @EnvironmentVariablesMetadata({
     group: EnvironmentVariablesGroup.LLM,
     description: 'Driver for the LLM chat model',