refactor(core): rename ngPipeDef to ɵpipe (#33142)

Pipe defs are not considered public API, so the property
that contains them should be prefixed with Angular's marker
for "private" ('ɵ') to discourage apps from relying on def
APIs directly.

This commit adds the prefix and shortens the name from
ngPipeDef to pipe. This is because property names
cannot be minified by Uglify without turning on property
mangling (which most apps have turned off) and are thus
size-sensitive.

PR Close #33142

packages/core/test/render3/ivy/jit_spec.ts

@@ -241,7 +241,7 @@ ivyEnabled && describe('render3 jit', () => {
     class P {
     }
 
-    const pipeDef = (P as any).ngPipeDef as PipeDef<P>;
+    const pipeDef = (P as any).ɵpipe as PipeDef<P>;
     const pipeFactory = (P as any).ɵfac as FactoryFn<P>;
     expect(pipeDef.name).toBe('test-pipe');
     expect(pipeDef.pure).toBe(false, 'pipe should not be pure');
@@ -254,7 +254,7 @@ ivyEnabled && describe('render3 jit', () => {
     class P {
     }
 
-    const pipeDef = (P as any).ngPipeDef as PipeDef<P>;
+    const pipeDef = (P as any).ɵpipe as PipeDef<P>;
     expect(pipeDef.pure).toBe(true, 'pipe should be pure');
   });
 

packages/core/test/render3/pipe_spec.ts

@@ -30,7 +30,7 @@ describe('pipe', () => {
       transform(value: any) { return new WrappedValue('Bar'); }
 
       static ɵfac = function WrappingPipe_Factory() { return new WrappingPipe(); };
-      static ngPipeDef = ɵɵdefinePipe({name: 'wrappingPipe', type: WrappingPipe, pure: false});
+      static ɵpipe = ɵɵdefinePipe({name: 'wrappingPipe', type: WrappingPipe, pure: false});
     }
 
     function createTemplate() {

packages/core/test/strict_types/inheritance_spec.ts

@@ -21,12 +21,12 @@ declare class SubComponent extends SuperComponent {
   static ɵcmp: ɵɵComponentDefWithMeta<SubComponent, '[sub]', never, {}, {}, never>;
 }
 
-declare class SuperPipe { static ngPipeDef: PipeDefWithMeta<SuperPipe, 'super'>; }
+declare class SuperPipe { static ɵpipe: PipeDefWithMeta<SuperPipe, 'super'>; }
 
 declare class SubPipe extends SuperPipe {
   onlyInSubtype: string;
 
-  static ngPipeDef: PipeDefWithMeta<SubPipe, 'sub'>;
+  static ɵpipe: PipeDefWithMeta<SubPipe, 'sub'>;
 }
 
 describe('inheritance strict type checking', () => {

packages/core/test/test_bed_spec.ts

@@ -660,20 +660,20 @@ describe('TestBed', () => {
              expect(DirectiveWithNoAnnotations.hasOwnProperty('ɵdir')).toBeTruthy();
              expect(SomeDirective.hasOwnProperty('ɵdir')).toBeTruthy();
 
-             expect(PipeWithNoAnnotations.hasOwnProperty('ngPipeDef')).toBeTruthy();
-             expect(SomePipe.hasOwnProperty('ngPipeDef')).toBeTruthy();
+             expect(PipeWithNoAnnotations.hasOwnProperty('ɵpipe')).toBeTruthy();
+             expect(SomePipe.hasOwnProperty('ɵpipe')).toBeTruthy();
 
              TestBed.resetTestingModule();
 
              // ng defs should be removed from classes with no annotations
              expect(ComponentWithNoAnnotations.hasOwnProperty('ɵcmp')).toBeFalsy();
              expect(DirectiveWithNoAnnotations.hasOwnProperty('ɵdir')).toBeFalsy();
-             expect(PipeWithNoAnnotations.hasOwnProperty('ngPipeDef')).toBeFalsy();
+             expect(PipeWithNoAnnotations.hasOwnProperty('ɵpipe')).toBeFalsy();
 
              // ng defs should be preserved on super types
              expect(SomeComponent.hasOwnProperty('ɵcmp')).toBeTruthy();
              expect(SomeDirective.hasOwnProperty('ɵdir')).toBeTruthy();
-             expect(SomePipe.hasOwnProperty('ngPipeDef')).toBeTruthy();
+             expect(SomePipe.hasOwnProperty('ɵpipe')).toBeTruthy();
            });
 
         it('should clean up overridden providers for modules that are imported more than once',