fix(ci): Delete pr_reviewer section in .pr_agent.toml (#11024)

Remove pr_reviewer section from configuration

<!-- Clearly explain the need for these changes: -->

### Changes 🏗️
removes the out of config status section
<!-- Concisely describe all of the changes made in this pull request:
-->

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  <!-- Put your test plan here: -->
  - [x] validated by global config

.pr_agent.toml

@@ -1,6 +1,3 @@
-[pr_reviewer]
-num_code_suggestions=0
-
 [pr_code_suggestions]
 commitable_code_suggestions=false
 num_code_suggestions=0