46044 Review, test and release update for HubSpot (Forms)

- Update Hubspot reference to CMS and Forms 15
- update client reference to backoffice 15

Author: dtng95

src/Umbraco.Forms.Integrations.Crm.Hubspot.Tests/Umbraco.Forms.Integrations.Crm.Hubspot.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>

src/Umbraco.Forms.Integrations.Crm.Hubspot/Client/config.outputPath.js

@@ -1 +1 @@
-export const outputPath = 'Debug' !== 'Release' ? '../wwwroot' : '../obj/Debug/net8.0/clientassets'
+export const outputPath = 'Debug' !== 'Release' ? '../wwwroot' : '../obj/Debug/net9.0/clientassets'