[chore] Add unmaintained components to ALLOWLIST file (open-telemetry#23368)

crobert-1 · Caleb-Hurshman · commit b450aa289b3e · 2023-07-06T15:13:54.000-04:00
As a result of issue open-telemetry#23246, a few components are now unmaintained. These need to be documented in the ALLOWLIST file.
diff --git a/.github/ALLOWLIST b/.github/ALLOWLIST
@@ -23,3 +23,6 @@ internal/common
 ## DEPRECATED components
 
 ## UNMAINTAINED components
+exporter/carbonexporter/
+receiver/carbonreceiver/
+receiver/wavefrontreceiver/
