fix(language-service): fix calculation of pipe spans (#35986)

This commit accomplishes two tasks:

- Fixes the span of queried pipes to only be applied on pipe names
- By consequence, fixes how pipes are located in arguments (previously,
  pipes with arguments could not be found because the span of a pipe
  uses a relative span, while the template position is absolute)

The screenshots attached to the PR for this commit demonstrate the
change.

Closes https://github.com/angular/vscode-ng-language-service/issues/677

PR Close #35986

packages/language-service/test/project/app/parsing-cases.ts

@@ -171,6 +171,7 @@ export class TemplateReference {
   anyValue: any;
   optional?: string;
   myClick(event: any) {}
+  birthday = new Date();
 }
 
 @Component({