chore: linkage monitor check should skipp clirr and enforcer

.kokoro/linkage-monitor.sh

@@ -23,7 +23,12 @@ cd github/java-billingbudgets/
 java -version
 echo ${JOB_TYPE}
 
-mvn install -DskipTests=true -Dmaven.javadoc.skip=true -Dgcloud.download.skip=true -B -V
+mvn install -B -V \
+  -DskipTests=true \
+  -Dclirr.skip=true \
+  -Denforcer.skip=true \
+  -Dmaven.javadoc.skip=true \
+  -Dgcloud.download.skip=true
 
 # Kokoro job cloud-opensource-java/ubuntu/linkage-monitor-gcs creates this JAR
 JAR=linkage-monitor-latest-all-deps.jar

synth.metadata

@@ -1,5 +1,5 @@
 {
-  "updateTime": "2020-01-31T08:41:40.784260Z",
+  "updateTime": "2020-02-01T08:40:34.549212Z",
   "sources": [
     {
       "generator": {
@@ -12,8 +12,9 @@
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "7ac66d9be8a7d7de4f13566d8663978c9ee9dcd7",
-        "internalRef": "292450564"
+        "sha": "b5cbe4a4ba64ab19e6627573ff52057a1657773d",
+        "internalRef": "292647187",
+        "log": "b5cbe4a4ba64ab19e6627573ff52057a1657773d\nSecurityCenter v1p1beta1: move file-level option on top to workaround protobuf.js bug.\n\nPiperOrigin-RevId: 292647187\n\nb224b317bf20c6a4fbc5030b4a969c3147f27ad3\nAdds API definitions for bigqueryreservation v1beta1.\n\nPiperOrigin-RevId: 292634722\n\nc1468702f9b17e20dd59007c0804a089b83197d2\nSynchronize new proto/yaml changes.\n\nPiperOrigin-RevId: 292626173\n\nffdfa4f55ab2f0afc11d0eb68f125ccbd5e404bd\nvision: v1p3beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292605599\n\n78f61482cd028fc1d9892aa5d89d768666a954cd\nvision: v1p1beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292605125\n\n60bb5a294a604fd1778c7ec87b265d13a7106171\nvision: v1p2beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292604980\n\n3bcf7aa79d45eb9ec29ab9036e9359ea325a7fc3\nvision: v1p4beta1 publish annotations and retry config\n\nPiperOrigin-RevId: 292604656\n\n2717b8a1c762b26911b45ecc2e4ee01d98401b28\nFix dataproc artman client library generation.\n\nPiperOrigin-RevId: 292555664\n\n"
       }
     },
     {