Disable watcher debug logging in full cluster restart qa tests,

maybe enabling it again when investigating watcher full cluster restart qa tests (#48381)

Author: martijnvg

x-pack/qa/full-cluster-restart/build.gradle

@@ -57,7 +57,6 @@ for (Version bwcVersion : BuildParams.bwcVersions.indexCompatible) {
       setting 'xpack.security.transport.ssl.key', 'testnode.pem'
       setting 'xpack.security.transport.ssl.certificate', 'testnode.crt'
       keystore 'xpack.security.transport.ssl.secure_key_passphrase', 'testnode'
-      setting 'logger.org.elasticsearch.xpack.watcher', 'DEBUG'
 
       if (bwcVersion.onOrAfter('6.7.0')) {
         setting 'xpack.security.authc.api_key.enabled', 'true'