feat: move Slack config to installation settings (#11548)

- enable Slack Configuration via InstallationConfig
- list Slack integration in super admin settings

app/views/super_admin/application/_icons.html.erb

@@ -159,4 +159,7 @@
   <symbol id="icon-shopify"  viewBox="0 0 32 32">
     <path fill="currentColor" d="m20.448 31.974l9.625-2.083s-3.474-23.484-3.5-23.641s-.156-.255-.281-.255c-.13 0-2.573-.182-2.573-.182s-1.703-1.698-1.922-1.88a.4.4 0 0 0-.161-.099l-1.219 28.141zm-4.833-16.901s-1.083-.563-2.365-.563c-1.932 0-2.005 1.203-2.005 1.521c0 1.641 4.318 2.286 4.318 6.172c0 3.057-1.922 5.01-4.542 5.01c-3.141 0-4.719-1.953-4.719-1.953l.859-2.781s1.661 1.422 3.042 1.422c.901 0 1.302-.724 1.302-1.245c0-2.156-3.542-2.255-3.542-5.807c-.047-2.984 2.094-5.891 6.438-5.891c1.677 0 2.5.479 2.5.479l-1.26 3.625zm-.719-13.969c.177 0 .359.052.536.182c-1.313.62-2.75 2.188-3.344 5.323a76 76 0 0 1-2.516.771c.688-2.38 2.359-6.26 5.323-6.26zm1.646 3.932v.182c-1.005.307-2.115.646-3.193.979c.62-2.37 1.776-3.526 2.781-3.958c.255.667.411 1.568.411 2.797zm.718-2.973c.922.094 1.521 1.151 1.901 2.339c-.464.151-.979.307-1.542.484v-.333c0-1.005-.13-1.828-.359-2.495zm3.99 1.718c-.031 0-.083.026-.104.026c-.026 0-.385.099-.953.281C19.63 2.442 18.625.927 16.849.927h-.156C16.183.281 15.558 0 15.021 0c-4.141 0-6.12 5.172-6.74 7.797c-1.594.484-2.75.844-2.88.896c-.901.286-.927.313-1.031 1.161c-.099.615-2.438 18.75-2.438 18.75L20.01 32z"/>
   </symbol>
-</svg>
+  <symbol id="icon-slack" viewBox="0 0 24 24">
+    <path fill="currentColor" d="M6.527 14.514A1.973 1.973 0 0 1 4.56 16.48a1.973 1.973 0 0 1-1.968-1.967c0-1.083.885-1.968 1.968-1.968h1.967zm.992 0c0-1.083.885-1.968 1.968-1.968s1.967.885 1.967 1.968v4.927a1.973 1.973 0 0 1-1.967 1.968a1.973 1.973 0 0 1-1.968-1.968zm1.968-7.987A1.973 1.973 0 0 1 7.519 4.56c0-1.083.885-1.967 1.968-1.967s1.967.884 1.967 1.967v1.968zm0 .992c1.083 0 1.967.884 1.967 1.967a1.973 1.973 0 0 1-1.967 1.968H4.56a1.973 1.973 0 0 1-1.968-1.968c0-1.083.885-1.967 1.968-1.967zm7.986 1.967c0-1.083.885-1.967 1.968-1.967s1.968.884 1.968 1.967a1.973 1.973 0 0 1-1.968 1.968h-1.968zm-.991 0a1.973 1.973 0 0 1-1.968 1.968a1.973 1.973 0 0 1-1.968-1.968V4.56c0-1.083.885-1.967 1.968-1.967s1.968.884 1.968 1.967zm-1.968 7.987c1.083 0 1.968.885 1.968 1.968a1.973 1.973 0 0 1-1.968 1.968a1.973 1.973 0 0 1-1.968-1.968v-1.968zm0-.992a1.973 1.973 0 0 1-1.968-1.967c0-1.083.885-1.968 1.968-1.968h4.927c1.083 0 1.968.885 1.968 1.968a1.973 1.973 0 0 1-1.968 1.967z"/>
+  </symbol>
+</svg>