refactor(language-service): rename host to tsLsHost (#32346)

Disambiguate the name of the Language Service Host used in constructing
a TypeScript Language Service Host by renaming the `host` property to
`tsLsHost`.

PR Close #32346

packages/language-service/src/language_service.ts

@@ -86,7 +86,7 @@ class LanguageServiceImpl implements LanguageService {
     if (fileName.endsWith('.ts')) {
       const sf = this.host.getSourceFile(fileName);
       if (sf) {
-        return getTsDefinitionAndBoundSpan(sf, position, this.host.host);
+        return getTsDefinitionAndBoundSpan(sf, position, this.host.tsLsHost);
       }
     }
   }