fix: use NotFoundError for missing team in org

Per [PR comment][1], better to use the provided error type that more
closely matches the error encountered.

[1]: https://github.com/backstage/backstage/pull/16059#discussion_r1103873709

Signed-off-by: Christopher Kruse <ckruse@flexport.com>

plugins/scaffolder-backend/src/scaffolder/actions/builtin/github/helpers.ts

@@ -15,7 +15,7 @@
  */
 
 import { Config } from '@backstage/config';
-import { assertError, InputError } from '@backstage/errors';
+import { assertError, InputError, NotFoundError } from '@backstage/errors';
 import {
   DefaultGithubCredentialsProvider,
   GithubCredentialsProvider,
@@ -370,7 +370,7 @@ async function validateAccessTeam(client: Octokit, access: string) {
     if (e.response.data.message === 'Not Found') {
       const message = `Received 'Not Found' from the API; one of org:
         ${org} or team: ${team_slug} was not found within GitHub.`;
-      throw new Error(message, { cause: e });
+      throw new NotFoundError(message);
     }
   }
 }