Add support for displaying and managing legacy SSO providers (#628)

* feat: add support for displaying and managing legacy SSO providers

- Introduced UI section for environment/YAML-configured SSO providers.
- Added warnings and guidance on migrating legacy providers to database-backed configuration.
- Enhanced localization with new keys for legacy provider management.
- Updated form and toggle components for improved usability.

* Expand SSO documentation: add SAML 2.0 support, JIT provisioning settings, super-admin setup steps, audit logging, and user administration details.

* Update JIT provisioning docs: clarify role mapping behavior and add examples; note new `logout_idp` audit log event.

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Co-authored-by: Josh Waldrep <joshua.waldrep5+github@gmail.com>

app/views/admin/sso_providers/_form.html.erb

@@ -55,9 +55,13 @@
       </div>
     </div>
 
-    <%= form.check_box :enabled,
-        label: "Enable this provider",
-        checked: sso_provider.enabled? %>
+    <div class="flex items-center justify-between">
+      <div class="space-y-1">
+        <p class="text-sm font-medium text-primary"><%= t("admin.sso_providers.form.enabled_label") %></p>
+        <p class="text-xs text-secondary"><%= t("admin.sso_providers.form.enabled_help") %></p>
+      </div>
+      <%= form.toggle :enabled %>
+    </div>
   </div>
 
   <div class="border-t border-primary pt-4 space-y-4">