[chore] Clean up CODEOWNERS (open-telemetry#23382)

**Description:** 

Clean up CODEOWNERS file to remove redundant lines; add these to the
ALLOWLIST.

**Link to tracking Issue:** mentioned on Zoom chat at the Collector SIG

.github/CODEOWNERS

@@ -43,7 +43,6 @@ exporter/awss3exporter/ @open-telemetry/collect
 exporter/awsxrayexporter/ @open-telemetry/collector-contrib-approvers @wangzlei @srprash
 exporter/azuremonitorexporter/ @open-telemetry/collector-contrib-approvers @pcwiese
 exporter/azuredataexplorerexporter/ @open-telemetry/collector-contrib-approvers @asaharan @ag-ramachandran
-exporter/carbonexporter/ @open-telemetry/collector-contrib-approvers 
 exporter/clickhouseexporter/ @open-telemetry/collector-contrib-approvers @hanjm @dmitryax @Frapschen
 exporter/cassandraexporter/ @open-telemetry/collector-contrib-approvers @atoulme @emreyalvac
 exporter/coralogixexporter/ @open-telemetry/collector-contrib-approvers @oded-dd @povilasv @matej-g
@@ -173,7 +172,6 @@ receiver/awsxrayreceiver/ @open-telemetry/collect
 receiver/azureblobreceiver/ @open-telemetry/collector-contrib-approvers @eedorenko @mx-psi
 receiver/azuremonitorreceiver/ @open-telemetry/collector-contrib-approvers @altuner @codeboten
 receiver/bigipreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski @StefanKurek
-receiver/carbonreceiver/ @open-telemetry/collector-contrib-approvers 
 receiver/chronyreceiver/ @open-telemetry/collector-contrib-approvers @MovieStoreGuy @jamesmoessis
 receiver/cloudflarereceiver/ @open-telemetry/collector-contrib-approvers @dehaansa @djaglowski
 receiver/cloudfoundryreceiver/ @open-telemetry/collector-contrib-approvers @agoallikmaa @pellared @crobert-1
@@ -184,7 +182,7 @@ receiver/dockerstatsreceiver/ @open-telemetry/collect
 receiver/elasticsearchreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski @binaryfissiongames
 receiver/expvarreceiver/ @open-telemetry/collector-contrib-approvers @jamesmoessis @MovieStoreGuy
 receiver/filelogreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski
-receiver/filereceiver/ @open-telemetry/collector-contrib-approvers @pmcollins @djaglowski
+receiver/filereceiver/  @open-telemetry/collector-contrib-approvers @pmcollins @djaglowski
 receiver/filestatsreceiver/ @open-telemetry/collector-contrib-approvers @atoulme
 receiver/flinkmetricsreceiver/ @open-telemetry/collector-contrib-approvers @jonathanwamsley @djaglowski
 receiver/fluentforwardreceiver/ @open-telemetry/collector-contrib-approvers @dmitryax
@@ -237,13 +235,12 @@ receiver/splunkhecreceiver/ @open-telemetry/collect
 receiver/snowflakereceiver/ @open-telemetry/collector-contrib-approvers @dmitryax @shalper2
 receiver/sqlqueryreceiver/ @open-telemetry/collector-contrib-approvers @dmitryax @pmcollins
 receiver/sqlserverreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski @StefanKurek
-receiver/sshcheckreceiver/ @open-telemetry/collector-contrib-approvers @nslaughter @codeboten
+receiver/sshcheckreceiver/  @open-telemetry/collector-contrib-approvers @nslaughter @codeboten
 receiver/statsdreceiver/ @open-telemetry/collector-contrib-approvers @jmacd @dmitryax
 receiver/syslogreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski
 receiver/tcplogreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski
 receiver/udplogreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski
 receiver/vcenterreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski @schmikei
-receiver/wavefrontreceiver/ @open-telemetry/collector-contrib-approvers 
 receiver/webhookeventreceiver/ @open-telemetry/collector-contrib-approvers @atoulme @shalper2
 receiver/windowseventlogreceiver/ @open-telemetry/collector-contrib-approvers @djaglowski @armstrmi
 receiver/windowsperfcountersreceiver/ @open-telemetry/collector-contrib-approvers @dashpole
@@ -253,3 +250,11 @@ receiver/zookeeperreceiver/ @open-telemetry/collect
 testbed/ @open-telemetry/collector-contrib-approvers @open-telemetry/collector-approvers
 testbed/mockdatareceivers/mockawsxrayreceiver/ @open-telemetry/collector-contrib-approvers @wangzlei @srprash
 testbed/mockdatasenders/mockdatadogagentexporter/ @open-telemetry/collector-contrib-approvers @boostchicken
+
+
+## UNMAINTAINED components
+## The Github issue template generation code needs this to generate the corresponding labels.
+
+exporter/carbonexporter/ @open-telemetry/collector-contrib-approvers 
+receiver/carbonreceiver/ @open-telemetry/collector-contrib-approvers 
+receiver/wavefrontreceiver/ @open-telemetry/collector-contrib-approvers