[MRELEASE-1158] Add property to include version in development commit comment

**[Mathias Legrand](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=JIRAUSER307182)** opened **[MRELEASE-1158](https://issues.apache.org/jira/browse/MRELEASE-1158?redirect=false)** and commented

Currently, only the following variables are interpolated to customize the commit comment for the next development version:
- @{prefix}
- @{groupId}
- @{artifactId}
- @{releaseLabel}

I would like to have a commit comment with the version. For example, `{}Next development version 2.0.0-SNAPSHOT{`}.

It would be great to have a new property (e.g. `{}@{version{`}}) to include the current project version.

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**Affects:** 3.1.1

No source file or test is named in the issue. Start by locating the code that interpolates @{prefix}, @{groupId}, @{artifactId}, and @{releaseLabel} in the Maven release plugin, then inspect nearby tests if present. Done means the development commit comment can interpolate the current project version, such as 2.0.0-SNAPSHOT.

Written by the indexing model from the issue text.