[MASSEMBLY-1005] Support properties in assembly descriptor

**[Slawomir Jaranowski](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=slawekjaranowski)** opened **[MASSEMBLY-1005](https://issues.apache.org/jira/browse/MASSEMBLY-1005?redirect=false)** and commented

We can use properties in assembly descriptors which will be interpolated.
Properties values are taken from current project properties.

When we use a descriptor as shared - we don't have access to properties defined in shared project.

Properties in assembly descriptor can be recognized as last, current project should have a precedence.

So we will can use properties in descriptors as default.

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**Remote Links:**
- [SF question
](https://stackoverflow.com/questions/77462748/set-default-value-in-shared-maven-assembly-file-but-allow-overrides-in-referenc)

The issue does not name files, tests, or an entry point. Start by locating assembly descriptor property interpolation and project-property handling, then determine how shared-descriptor defaults and current-project overrides should be resolved; done means properties work in descriptors with current-project values taking precedence.

Written by the indexing model from the issue text.