Change freeze and officially 1.9.0 release PR (#41874)

* Prepare evals SDK Release

* Fix bug

* Fix for ADV_CONV for FDP projects

* Update release date

* re-add pyrit to matrix

* Change grader ids

* Update unit test

* replace all old grader IDs in tests

* Update platform-matrix.json

Add pyrit and not remove the other one

* Update test to ensure everything is mocked

* tox/black fixes

* Skip that test with issues

* update grader ID according to API View feedback

* Update test

* remove string check for grader ID

* Update changelog and officialy start freeze

---------

Co-authored-by: Nagkumar Arkalgud <nagkumar@naarkalg-work-mac.local>
Co-authored-by: Nagkumar Arkalgud <nagkumar@Mac.lan>

Author: 3 people

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

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.9.0 (Unreleased)
+## 1.9.0 (2025-07-02)
 
 ### Features Added