chore: Add internal feature flags for Chatwoot Cloud (#10902)

This PR introduces internal feature flags for testing purposes. These
flags will not be displayed on regular instances to prevent customer
confusion.

Additionally, a new feature flag, `contact_chatwoot_support_team`, has
been added for Chatwoot Cloud. This flag disables contact support for
third-party onboarded accounts, as support will be handled by the
original affiliate team.

Co-authored-by: Pranav <pranav@chatwoot.com>

config/features.yml

@@ -71,6 +71,7 @@
 - name: response_bot
   enabled: false
   premium: true
+  chatwoot_internal: true
 - name: message_reply_to
   enabled: false
   help_url: https://chwt.app/hc/reply-to
@@ -96,3 +97,6 @@
   enabled: false
 - name: report_v4
   enabled: false
+- name: contact_chatwoot_support_team
+  enabled: true
+  chatwoot_internal: true