Remove old maven mirror (Azure#40180)

* Remove old maven mirror

* Remove commented out reference to deleted mirror

eng/maven.publish.settings.xml

@@ -21,15 +21,4 @@
   <activeProfiles>
     <activeProfile>signing</activeProfile>
   </activeProfiles>
-
-  <!--
-  NOTE: Maven Central downloads are quite unreliable. This gives us better reliability.
-  -->
-  <mirrors>
-      <mirror>
-          <id>repo-maven-apache-org-mirror</id>
-          <url>https://repo-maven-apache-org.azurefd.net/maven2</url>
-          <mirrorOf>central</mirrorOf>
-      </mirror>
-  </mirrors>
-</settings>
+</settings>

eng/settings.xml

@@ -1,24 +1,4 @@
 <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                       https://maven.apache.org/xsd/settings-1.0.0.xsd">
-    <!--
-
-    NOTE: We were using these mirror settings when we were getting
-          blocked by Maven Central. However the proxy approach we were
-          using has started failing 20% of the time and it seems that
-          Maven Central is no longer blocking us, with a failure rate
-          of about 5%. So these mirror settings have been removed.
-
-    <mirrors>
-        <mirror>
-            <id>repo-maven-apache-org-mirror</id>
-            <url>https://repo-maven-apache-org.azurefd.net/maven2</url>
-            <mirrorOf>central</mirrorOf>
-        </mirror>
-        <mirror>
-            <id>oss-sonatype-org-mirror</id>
-            <url>https://oss-sonatype-org.azurefd.net/content/repositories/snapshots/</url>
-            <mirrorOf>ossrh</mirrorOf>
-        </mirror>
-    </mirrors> -->
-</settings>
+</settings>