Error message on missing required input param prompts user to "Please report this issue"

[bigdaz]

When using the plugin without the correct environment variables set, the resulting exception looks like:

Caused by: org.gradle.api.GradleException: The GitHubDependencyGraphPlugin plugin encountered errors while writing the dependency snapshot json file. 
Please report this issue at: https://github.com/gradle/github-dependency-graph-gradle-plugin/issues
at org.gradle.github.dependencygraph.internal.DependencyExtractor.close(DependencyExtractor.kt:271)
at org.gradle.api.services.internal.RegisteredBuildServiceProvider.lambda$maybeStop$1(RegisteredBuildServiceProvider.java:168)
... 132 more
Caused by: java.lang.IllegalStateException: The configuration parameter 'GITHUB_JOB_CORRELATOR' must be set: set an environment variable, or use '-DGITHUB_JOB_CORRELATOR=value' on the command-line.

Since this is a user configuration error, the exception should not prompt users to report an issue.