refactor(language-service): cleanup of low-hanging TODOs (#34784)

Cleans up some simple TODOs. Also removes
`typescript_symbols#getTypeWrapper`, which I thought I had but failed to
remove in #34571.

PR Close #34784

packages/language-service/src/locate_symbol.ts

@@ -98,8 +98,6 @@ export function locateSymbol(info: AstResult, position: number): SymbolInfo|unde
             }
 
             // See if this attribute matches the selector of any directive on the element.
-            // TODO(ayazhafiz): Consider caching selector matches (at the expense of potentially
-            // very high memory usage).
             const attributeSelector = `[${ast.name}=${ast.value}]`;
             const parsedAttribute = CssSelector.parse(attributeSelector);
             if (!parsedAttribute.length) return;