feat(ee): Add SLA management UI (#8777)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/dashboard/i18n/locale/en/settings.json

@@ -238,6 +238,7 @@
     "REPORTS_INBOX": "Inbox",
     "REPORTS_TEAM": "Team",
     "SET_AVAILABILITY_TITLE": "Set yourself as",
+    "SLA": "SLA",
     "BETA": "Beta",
     "REPORTS_OVERVIEW": "Overview",
     "FACEBOOK_REAUTHORIZE": "Your Facebook connection has expired, please reconnect your Facebook page to continue services",