feat: Hide installation identifier (#11722)

<img width="1779" alt="Screenshot 2025-06-12 at 7 21 59 PM"
src="https://github.com/user-attachments/assets/a4c54d7f-4f5f-4d72-a81b-be4d88066549"
/>




## Summary
- Hides installation identifier by default so that users don't
accidentally expose it in screenshots.

app/views/fields/secret_field/_index.html.erb

@@ -3,7 +3,7 @@
 %>
 <%= javascript_include_tag "secretField" %>
 <div data-secret-text="<%= field.data %>" class="cell-data__secret-field">
-  <span data-secret-masked="true">••••••••••</span>
+  <span data-secret-masked="true"></span>
   <button onclick="toggleSecretField(event)" data-secret-toggler>
     <svg width="20" height="20">
       <use xlink:href="#eye-show" />

app/views/fields/secret_field/_show.html.erb

@@ -4,7 +4,7 @@
 <%= javascript_include_tag "secretField" %>
 
 <div data-secret-text="<%= field.data %>" class="cell-data__secret-field">
-  <span data-secret-masked="true">••••••••••</span>
+  <span data-secret-masked="true"></span>
   <button onclick="toggleSecretField(event)" data-secret-toggler>
     <svg width="20" height="20">
       <use xlink:href="#eye-show" />