Address review feedback

- Remove {@link} from @deprecated tag (freben feedback)
- Use Object.hasOwn instead of hasOwnProperty
- Use NotImplementedError instead of plain Error
- Add @backstage/errors dependency
- Add tests for withApis in core-compat-api

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/frontend-plugin-api/src/apis/system/useApi.tsx

@@ -57,7 +57,7 @@ export function useApi<T>(apiRef: ApiRef<T>): T {
  * Wrapper for giving component an API context.
  *
  * @param apis - APIs for the context.
- * @deprecated Use {@link withApis} from `@backstage/core-compat-api` instead.
+ * @deprecated Use `withApis` from `@backstage/core-compat-api` instead.
  * @public
  */
 export function withApis<T extends {}>(apis: TypesToApiRefs<T>) {