fix(core): Attribute decorator attributeName is mandatory (#38131)

`Attribute` decorator has defined `attributeName` as optional but actually its
 mandatory and compiler throws an error if `attributeName` is undefined. Made
`attributeName` mandatory in the `Attribute` decorator to reflect this functionality

Fixes #32658

PR Close #38131

goldens/public-api/core/core.d.ts

@@ -53,7 +53,7 @@ export declare function asNativeElements(debugEls: DebugElement[]): any;
 export declare function assertPlatform(requiredToken: any): PlatformRef;
 
 export declare interface Attribute {
-    attributeName?: string;
+    attributeName: string;
 }
 
 export declare const Attribute: AttributeDecorator;