chore: filter @lwc/engine-server fixture test warnings for `lwc:dyn…

…amic` only (#4072)

* chore: filter engine-server warnings for lwc:dynamic only

* chore: add comment for warning

packages/@lwc/engine-server/src/__tests__/fixtures.spec.ts

@@ -43,7 +43,12 @@ async function compileFixture({ input, dirname }: { input: string; dirname: stri
  }),
  ],
  onwarn(warning) {
- warnings.push(warning);
+ if (warning.message.includes('LWC1187')) {
+ // TODO [#3331]: The existing lwc:dynamic fixture test will generate warnings that can be safely suppressed.
+ // The warning message is expected and appears when the compiler detects usage of the directive.
+ // We plan to remove the directive in a future release, see #3331 for details.
+ warnings.push(warning);
+ }
  },
  });