fix: remove work/personal onboarding telemetry (#24021)

Following on from #23989 #24018 

- We also no longer want to collect `IsBusiness` demographic data
- Newsletter fields no longer allow `nil` as a value, instead default to
false

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/reference/api/schemas.md

@@ -2282,7 +2282,6 @@ AuthorizationObject can represent a "set" of objects, such as: all workspaces in
 
 ```json
 {
-  "is_business": true,
   "newsletter_marketing": true,
   "newsletter_releases": true
 }
@@ -2292,7 +2291,6 @@ AuthorizationObject can represent a "set" of objects, such as: all workspaces in
 
 | Name                   | Type    | Required | Restrictions | Description |
 |------------------------|---------|----------|--------------|-------------|
-| `is_business`          | boolean | false    |              |             |
 | `newsletter_marketing` | boolean | false    |              |             |
 | `newsletter_releases`  | boolean | false    |              |             |
 
@@ -2303,7 +2301,6 @@ AuthorizationObject can represent a "set" of objects, such as: all workspaces in
   "email": "string",
   "name": "string",
   "onboarding_info": {
-    "is_business": true,
     "newsletter_marketing": true,
     "newsletter_releases": true
   },

docs/reference/api/users.md

@@ -246,7 +246,6 @@ curl -X POST http://coder-server:8080/api/v2/users/first \
   "email": "string",
   "name": "string",
   "onboarding_info": {
-    "is_business": true,
     "newsletter_marketing": true,
     "newsletter_releases": true
   },