[MCHANGES-388] Add option to include issues using the -SNAPSHOT suffix for version/milestone

**[Marcelo Riss](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mriss)** opened **[MCHANGES-388](https://issues.apache.org/jira/browse/MCHANGES-388?redirect=false)** and commented

I have a use case where the version id/name at the issue tracking system (GHE) will have the -SNAPSHOT suffix. Currently, when setting GHE as issue tracking system and the parameter **[onlyCurrentVersion](http://maven.apache.org/plugins/maven-changes-plugin/github-report-mojo.html#onlyCurrentVersion)** to true, the -SNAPSHOT suffix is removed when filtering the issues. My suggestion is to add a configuration parameter allowing to consider or not the -SNAPSHOT suffix as the version id/name when searching for issues. 

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**Attachments:**
- [pom.xml](https://issues.apache.org/jira/secure/attachment/12923181/pom.xml) (_6.54 kB_)

Start with the GitHub report mojo and the existing onlyCurrentVersion handling described in the issue. Trace where the version is normalized before issue filtering, then identify the configuration and verification points needed so both suffix-preserving and suffix-stripping behavior can be selected.

Written by the indexing model from the issue text.