settings: Migration for fixing duplicated agent keys (#30237)

As a byproduct, this fixes bug where it's impossible to change Agent
profile

Closes #30000 

Release Notes:

- N/A

crates/migrator/src/migrations.rs

@@ -63,3 +63,9 @@ pub(crate) mod m_2025_05_05 {
 
     pub(crate) use settings::SETTINGS_PATTERNS;
 }
+
+pub(crate) mod m_2025_05_08 {
+    mod settings;
+
+    pub(crate) use settings::SETTINGS_PATTERNS;
+}