[MDEP-852] Missing way to exclude unused only for test scope

**[Bogdan Drutu](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=bogdandrutu)** opened **[MDEP-852](https://issues.apache.org/jira/browse/MDEP-852?redirect=false)** and commented

Maven has a missing feature in not supporting "runtime-test" scope, which is a good candidate for junit5 engine artifact `org.junit.jupiter:junit-jupiter-engine`.

Because I don't want this to be scoped as "runtime" (for obvious reasons) I recommend users to set "test" scope for this target, so I added it as `
ignoredUnusedDeclaredDependency`. This works, but it is too generic and allows bad usages like having the junit-jupiter-engine as runtime or even compile time. I would like to be able to say ignore unused dependency only for test scope, sorry if I miss some obvious way to do this.

---
No further details from [MDEP-852](https://issues.apache.org/jira/browse/MDEP-852?redirect=false)

The issue names the ignoredUnusedDeclaredDependency configuration but no source files or tests. Start by locating its handling and related test coverage, then determine how test-scope-only exclusions should be represented and verified.

Written by the indexing model from the issue text.