Update CODEOWNERS_baseline_errors.txt (#23191)

* Update .github/CODEOWNERS_baseline_errors.txt

Author: RickWinter

.github/CODEOWNERS_baseline_errors.txt

@@ -1,4 +1,3 @@
-chlowell is not a public member of Azure.
 lirenhe is not a public member of Azure.
 'Open Telemetry' is not a valid label for this repository.
 adamedx is an invalid user. Ensure the user exists, is public member of Azure and has write permissions.
@@ -217,3 +216,4 @@ ccmixpdevs is an invalid user. Ensure the user exists, is public member of Azure
 ccmbpxpcrew is an invalid user. Ensure the user exists, is public member of Azure and has write permissions.
 TiagoCrewGitHubIssues is an invalid user. Ensure the user exists, is public member of Azure and has write permissions.
 ccmshowbackdevs is an invalid user. Ensure the user exists, is public member of Azure and has write permissions.
+maertendMSFT is an invalid user. Ensure the user exists, is public member of Azure and has write permissions.