fix: Intercom setting anonymous user a common user id (#36017)

## Description

Avoids setting the `user_id` field in intercom when the user is not
logged in

Fixes appsmithorg/appsmith-ee#5003


## Automation

/ok-to-test tags="@tag.Sanity"

### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!IMPORTANT]
> 🟣 🟣 🟣 Your tests are running.
> Tests running at:
<https://github.com/appsmithorg/appsmith/actions/runs/10631847104>
> Commit: 1eaad31
> Workflow: `PR Automation test suite`
> Tags: `@tag.Sanity`
> Spec: ``
> <hr>Fri, 30 Aug 2024 11:26:34 UTC
<!-- end of auto-generated comment: Cypress test results  -->


## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Enhanced user information handling for improved privacy in the
application.
- Anonymous users will no longer have their usernames processed,
ensuring greater data protection.

- **Bug Fixes**
- Refined logic for extracting user information to prevent exposure of
sensitive data.

- **Documentation**
- Updated comments and documentation to reflect changes in user data
handling and privacy measures.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/src/utils/bootIntercom.ts

@@ -1,4 +1,4 @@
-import type { User } from "constants/userConstants";
+import { ANONYMOUS_USERNAME, type User } from "constants/userConstants";
 import { getAppsmithConfigs } from "ee/configs";
 import { sha256 } from "js-sha256";
 import { getLicenseKey } from "ee/utils/licenseHelpers";
@@ -7,9 +7,12 @@ const { appVersion, cloudHosting, intercomAppID } = getAppsmithConfigs();
 
 export default function bootIntercom(user?: User) {
   if (intercomAppID && window.Intercom) {
-    let { email, username } = user || {};
-    let name;
-    if (!cloudHosting) {
+    let name: string | undefined = user?.name;
+    let email: string | undefined = user?.email;
+    let username =
+      user?.username === ANONYMOUS_USERNAME ? undefined : user?.username;
+    if (!cloudHosting && username) {
+      // We are hiding their information when self-hosted
       username = sha256(username || "");
       // keep email undefined so that users are prompted to enter it when they reach out on intercom
       email = undefined;