Regenerate Azure.Provisioning.PostgreSql from updated management library

- Update Azure.ResourceManager.PostgreSql package version to 1.4.1 in eng/Packages.Data.props
- Regenerate provisioning library using the generator with --filter PostgreSql
- Adds PostgreSQL versions 17 and 18 to PostgreSqlFlexibleServerVersion enum
- Fix schema generation conflict when a leaf property path is a prefix of
  another property path (e.g., 'properties' vs 'properties.administratorLogin')
- Suppress CS0618 warning for deprecated ActiveDirectoryAdministratorResource

Fixes #55583

Author: ArcturusZhang

eng/Packages.Data.props

@@ -196,7 +196,7 @@
     <PackageReference Update="Azure.ResourceManager.ManagedServiceIdentities" Version="1.4.0" />
     <PackageReference Update="Azure.ResourceManager.Network" Version="1.14.0" />
     <PackageReference Update="Azure.ResourceManager.OperationalInsights" Version="1.3.1" />
-    <PackageReference Update="Azure.ResourceManager.PostgreSql" Version="1.3.1" />
+    <PackageReference Update="Azure.ResourceManager.PostgreSql" Version="1.4.1" />
     <PackageReference Update="Azure.ResourceManager.PrivateDns" Version="1.2.1" />
     <PackageReference Update="Azure.ResourceManager.Redis" Version="1.5.1" />
     <PackageReference Update="Azure.ResourceManager.RedisEnterprise" Version="1.3.0" />

sdk/provisioning/Azure.Provisioning.PostgreSql/CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Features Added
 
+- Regenerated from updated `Azure.ResourceManager.PostgreSql` 1.4.1 package, adding PostgreSQL versions 17 and 18 to `PostgreSqlFlexibleServerVersion`.
+
 ### Breaking Changes
 
 ### Bugs Fixed