"Find Usages" does not work for `LSPSemanticTokenElementType.DECLARATION`

At the moment, elements with type LSPSemanticTokenElementType.DECLARATION are not handled correctly by the "Find Usages" functionality.
As a result, it is impossible to invoke "Find Usages" for a class (or other declarations) that are recognized as DECLARATION type.

Actual behavior

• I have a class defined in the project.
• When trying to invoke Find Usages on it, the action does not work.
• Investigation shows that the element is recognized as LSPSemanticTokenElementType.DECLARATION, and the current logic does not support this case.

Expected behavior

• "Find Usages" should work correctly for elements with LSPSemanticTokenElementType.DECLARATION.
• Classes and other declarations should be searchable as usage targets.

Tech notes:

The logic is here:

com.redhat.devtools.lsp4ij.features.semanticTokens.viewProvider.LSPSemanticTokensSingleRootFileViewProvider#getSemanticTokenReference

protected @Nullable PsiReference getSemanticTokenReference(int offset) { LSPSemanticToken semanticToken = this.isEnabled() ? this.getSemanticToken(offset) : null; LSPSemanticTokenElementType elementType = semanticToken != null ? semanticToken.getElementType() : null; return elementType == LSPSemanticTokenElementType.REFERENCE ? new LSPSemanticTokenPsiReference(semanticToken) : null; }

Start at com.redhat.devtools.lsp4ij.features.semanticTokens.viewProvider.LSPSemanticTokensSingleRootFileViewProvider#getSemanticTokenReference and inspect how semantic token element types become PSI references. Reproduce Find Usages for a class or declaration recognized as LSPSemanticTokenElementType.DECLARATION, then verify that declarations are searchable as usage targets.