Updating the 1.18.0 release date in change log (#36302)

* fixing sweep job service response parsing issue

* fixing sweep job service response parsing issue

* raising a work around for cmd job and spark job name lowering case

* fixing black issue

* fixing serialization issue in sweep job

* include black fix

* found and fix the issue in compute validation

* fixing a corrupt wokspace arm template

* fixing the failed test case

* updating the date for 1.18.0 release

* removing empty section

Author: achauhan-scc

sdk/ml/azure-ai-ml/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.18.0 (unreleased)
+## 1.18.0 (2024-07-09)
 
 ### Features Added
 
@@ -10,8 +10,6 @@ Expose `public_ip_address` in `AmlComputeNodeInfo`, to get the public ip address
 - InputTypes exported in constants module
 - WorkspaceConnection tags are now listed as deprecated, and the erroneously-deprecated metadata field has been un-deprecated and added as a initialization field. These two fields still point to the same underlying object property, and actual API usage of this value is unchanged.
 
-### Breaking Changes
-
 ### Other Changes
 - WorkspaceConnections are officially GA'd and no longer experimental. But its much newer subclasses remain experimental.