[SUREFIRE-2258] Wrongly complains about system property overwritten by user property when using placeholder

**[Falko Modler](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=famod)** opened **[SUREFIRE-2258](https://issues.apache.org/jira/browse/SUREFIRE-2258?redirect=false)** and commented

After SUREFIRE-1385 the plugin is complaining with:

> [WARNING] System property [sha1] overwritten by user properties from Maven session

when using:

```xml

${sha1}

```

This warning looks wrong to me in this case because I'm explicitly using a placeholder, not a static value.

For context, I'm setting as project version (["CI friendly"](https://maven.apache.org/maven-ci-friendly.html)):

```xml
${revision}.${changelist}${sha1}
```

and in project properties:

```xml

```

And in [direnv](https://direnv.net/) `.envrc` I have:

```java
export MAVEN_ARGS="-Dsha1=-dev1"
```

(or dev2, dev3 etc., depending on the clone)

---

**Affects:** 3.4.0

Start by reproducing the Maven configuration shown for SUREFIRE-2258, including the ${sha1} placeholder and the user property from MAVEN_ARGS, then compare the warning behavior introduced by SUREFIRE-1385. Done means the plugin no longer reports an overwrite for this placeholder-based configuration while preserving the expected behavior for genuinely static values.

Written by the indexing model from the issue text.