missing pieces in the AST: parser seems to skip member value pair name when there is a . at the end

Similar to https://github.com/eclipse-jdt/eclipse.jdt.core/issues/3155, I am working on code completion based on AST nodes and came across this case for a field declaration, as another follow-up from #3156:

```
@Value(value=spring.)
```

results in an AST that looks like:

```
@Value(value.$missing$)
```

It looks like the parser turns this annotation into a `SingleMemberAnnotation` with a `QualifiedName`, where it should keep the usual member value pair structure.

(using `org.eclipse.jdt.core` 3.40.0)
@FYI @mickaelistria and @stephan-herrmann)

Reproduce the annotation example `@Value(value=spring.)` and inspect the resulting AST shape, comparing it with the expected member value pair structure. Start by tracing the parser path for annotations, qualified names, and incomplete expressions; done means the trailing-dot case retains the usual member value pair structure.

Written by the indexing model from the issue text.