Remove owners for tools/run_tests/performance

.github/CODEOWNERS

@@ -6,4 +6,3 @@
 /cmake/** @jtattermusch @nicolasnoble @apolcyn
 /src/core/ext/filters/client_channel/** @markdroth @apolcyn @AspirinSJL
 /tools/dockerfile/** @jtattermusch @apolcyn @nicolasnoble
-/tools/run_tests/performance/** @ncteisen @apolcyn @jtattermusch

tools/run_tests/performance/OWNERS

@@ -1,9 +0,0 @@
-set noparent
-
-# These owners are in place to ensure that scenario_result_schema.json is not
-# modified without also running tools/run_tests/performance/patch_scenario_results_schema.py
-# to update the BigQuery schema
-
-@ncteisen
-@apolcyn
-@jtattermusch