refactor: fix pipe type

An explicit cast was removed in fa9bce0#diff-29e41c6172a2d68db9886be9e933ed2b477732095313e104c52a725f887276cf which relies on [control flow narrowing](https://devblogs.microsoft.com/typescript/announcing-typescript-5-5/#control-flow-narrowing-for-constant-indexed-accesses) in TS 5.5. However, google3 is still on TS 5.4, so we can't fully depend on that feature. Using an intermediate variable makes the type narrowing work correctly even in TS 5.4.

Author: dgp1130

packages/angular_devkit/schematics/src/rules/template.ts

@@ -133,12 +133,13 @@ export function applyPathTemplate<T extends PathTemplateData>(
           if (!(pipe in data)) {
             throw new UnknownPipeException(pipe);
           }
-          if (typeof data[pipe] != 'function') {
+          const pipeFn = data[pipe];
+          if (typeof pipeFn != 'function') {
             throw new InvalidPipeException(pipe);
           }
 
           // Coerce to string.
-          return '' + data[pipe](acc);
+          return '' + pipeFn(acc);
         }, '' + replacement);
       }