fix(ivy): correctly project bare ICU expressions (#30696)

Projecting bare ICU expressions failed because we would assume that component's content nodes would be projected later and doing so at that point would be wasteful. But ICU nodes are handled independently and should be inserted immediately because they will be ignored by projections.

FW-1348 #resolve

PR Close #30696

packages/core/test/acceptance/i18n_spec.ts

@@ -591,6 +591,33 @@ onlyInIvy('Ivy i18n logic').describe('runtime i18n', () => {
          fixture.detectChanges();
          expect(fixture.nativeElement.innerHTML).toEqual('no email<!--ICU 2-->');
        });
+
+    it('projection', () => {
+      @Component({selector: 'child', template: '<div><ng-content></ng-content></div>'})
+      class Child {
+      }
+
+      @Component({
+        selector: 'parent',
+        template: `
+      <child i18n>{
+        value // i18n(ph = "blah"),
+        plural,
+         =1 {one}
+        other {at least {{value}} .}
+      }</child>`
+      })
+      class Parent {
+        value = 3;
+      }
+      TestBed.configureTestingModule({declarations: [Parent, Child]});
+      ɵi18nConfigureLocalize({translations: {}});
+
+      const fixture = TestBed.createComponent(Parent);
+      fixture.detectChanges();
+
+      expect(fixture.nativeElement.innerHTML).toContain('at least');
+    });
   });
 
   describe('should support attributes', () => {