Contact source change for webinar and gated doc (#43838)

Updating the contact source value for webinars and gated docs to match
the new sfdc values



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

* **Bug Fixes**
* Corrected CRM contact-source classification so webinar access requests
and whitepaper downloads are categorized separately from general contact
form submissions.

* **Chores**
* Expanded accepted contact-source values in the CRM integration to
include distinct labels for webinars and gated documents.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

website/api/controllers/deliver-webinar-access-request.js

@@ -40,7 +40,7 @@ module.exports = {
         emailAddress: emailAddress,
         firstName: firstName,
         lastName: lastName,
-        contactSource: 'Website - Contact forms',
+        contactSource: 'Webinar',
         description: `Submitted a form to watch the ${webinarName} webinar.`,
         marketingAttributionCookie: attributionCookieOrUndefined
       }).intercept((err)=>{

website/api/controllers/deliver-whitepaper-download-request.js

@@ -40,7 +40,7 @@ module.exports = {
         emailAddress: emailAddress,
         firstName: firstName,
         lastName: lastName,
-        contactSource: 'Website - Contact forms',
+        contactSource: 'Website - Gated document',
         description: `Submitted a form to download the ${whitepaperName} whitepaper.`,
         marketingAttributionCookie: attributionCookieOrUndefined
       }).intercept((err)=>{

website/api/helpers/salesforce/update-or-create-contact-and-account.js

@@ -58,6 +58,8 @@ module.exports = {
         'Website - Newsletter',
         'Website - Sign up',
         'Website - Swag request',
+        'Website - Gated document',
+        'Webinar',
       ],
     },
     getStartedResponses: {