UI - Update metadata error states on Sso settings form (#25614)

## For #25318 

<img width="1464" alt="Screenshot 2025-01-20 at 12 29 32 PM"
src="https://github.com/user-attachments/assets/80512d78-03e6-40fe-a098-109b0c731fe7"
/>

- [x] Changes file added for user-visible changes in `changes/`
- [x] Manual QA for all new/changed functionality

---------

Co-authored-by: Jacob Shandling <jacob@fleetdm.com>

changes/25318-update-sso-settings-error-states

@@ -0,0 +1 @@
+* Add clearer error states to metadata-related fields in the SSO settings form

frontend/pages/admin/OrgSettingsPage/cards/Sso/Sso.tsx

@@ -51,8 +51,10 @@ const validate = (formData: ISsoFormData) => {
 
     if (!metadata) {
       if (!metadataUrl) {
-        errors.metadata_url = "Metadata or Metadata URL must be present";
-        errors.metadata = "Metadata or Metadata URL must be present";
+        errors.metadata_url =
+          "Metadata URL is required (if metadata is not present)";
+        errors.metadata =
+          "Metadata is required (if metadata URL is not present)";
       } else if (
         !validUrl({ url: metadataUrl, protocols: ["http", "https"] })
       ) {