refactor(@angular-devkit/schematics): support isolatedDeclarations for tree classes
#32315
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This commit refactors several Tree implementations (
DelegateTree,HostTree,NullTree,ScopedTree) to support the TypeScriptisolatedDeclarationscompiler option. It uses declaration merging to define the[TreeSymbol]method on an interface and assigns it in the constructor to avoid TS9038 errors regarding computed property names inference.