reportonlyreachable still fails on optional

使用 linkage-checker-enforcer-rules:1.5.12 以及 reportOnlyReachable 教程中展示的 LinkageCheckerRule 配置复现该故障。首先阅读 LinkageCheckerRule 的实现及其对可选依赖路径的处理方式。当报告的可选 Jansi 引用不再导致 reportOnlyReachable 失败，并且针对该依赖设置有回归测试时，即表示完成。

I have a plugin that depends on maven-core:3.8.2. Even with the reportonlyreachable flag set true,
https://github.com/GoogleCloudPlatform/cloud-opensource-java/wiki/Linkage-Checker-Enforcer-Rule-Tutorial#reportonlyreachable-flag
the rule fails with

[ERROR] Linkage Checker rule found 3 reachable errors:
Class org.fusesource.jansi.Ansi is not found;
referenced by 2 class files
org.apache.maven.shared.utils.logging.AnsiMessageBuilder (org.apache.maven.shared:maven-shared-utils:3.3.4)
org.apache.maven.shared.utils.logging.Style (org.apache.maven.shared:maven-shared-utils:3.3.4)
Cause:
The valid symbol is in org.fusesource.jansi:jansi🫙2.2.0 at com.etc:etc-maven-plugin🫙2.2.0 / org.apache.maven.shared:maven-shared-utils:3.3.4 (compile) / org.fusesource.jansi:jansi:2.2.0 (compile, optional) but it was not selected because the path contains an optional dependency
Class org.fusesource.jansi.AnsiConsole is not found;
referenced by 1 class file
org.apache.maven.shared.utils.logging.MessageUtils (org.apache.maven.shared:maven-shared-utils:3.3.4)
Cause:
The valid symbol is in org.fusesource.jansi:jansi🫙2.2.0 at com.etc:etc-maven-plugin🫙2.2.0 / org.apache.maven.shared:maven-shared-utils:3.3.4 (compile) / org.fusesource.jansi:jansi:2.2.0 (compile, optional) but it was not selected because the path contains an optional dependency
Class org.fusesource.jansi.Ansi$Color is not found;
referenced by 1 class file
org.apache.maven.shared.utils.logging.Style (org.apache.maven.shared:maven-shared-utils:3.3.4)
Cause:
The valid symbol is in org.fusesource.jansi:jansi🫙2.2.0 at com.etc:etc-maven-plugin🫙2.2.0 / org.apache.maven.shared:maven-shared-utils:3.3.4 (compile) / org.fusesource.jansi:jansi:2.2.0 (compile, optional) but it was not selected because the path contains an optional dependency
Problematic artifacts in the dependency tree:
org.apache.maven.shared:maven-shared-utils:3.3.4 is at:
com.etc:etc-maven-plugin🫙2.2.0 / org.apache.maven.shared:maven-shared-utils:3.3.4 (compile)

<rules>
  <LinkageCheckerRule implementation="com.google.cloud.tools.dependencies.enforcer.LinkageCheckerRule">
    <level>ERROR</level>
    <reportOnlyReachable>true</reportOnlyReachable>
  <LinkageCheckerRule>
<rules>

linkage-checker-enforcer-rules:1.5.12