Enable system test for httpcheck package

Author: mrodm

test/packages/parallel/httpcheck/_dev/test/system/test-local-config.yml

@@ -1,6 +1,6 @@
-skip:
-  reason: Not supported system tests with input type otelcol.
-  link: https://github.com/elastic/elastic-package/issues/2835
+# skip:
+#   reason: Not supported system tests with input type otelcol.
+#   link: https://github.com/elastic/elastic-package/issues/2835
 service: web
 vars:
   period: 1s