message: Simplified default sign-in resolver to split on e-mail address
diff: @@ -200,7 +200,7 @@ export const oAuth2EmailSignInResolver: SignInResolver<OAuthResult> = async (
  const entity = await ctx.catalogIdentityClient.findUser({
  annotations: {
  - 'oauth2/email': profile.email,
  + 'backstage.io/email': profile.email,
  },
  });
  @@ -220,21 +220,7 @@ export const oAuth2DefaultSignInResolver: SignInResolver<OAuthResult> = async (
  throw new Error('Profile contained no email');
  }
  - let userId: string;
  -
  - try {
  - const entity = await ctx.catalogIdentityClient.findUser({
  - annotations: {
  - 'oauth2/email': profile.email,
  - },
  - });
  - userId = entity.metadata.name;
  - } catch (error) {
  - ctx.logger.warn(
  - `Failed to look up user, ${error}, falling back to allowing login based on email pattern, this will probably break in the future`,
  - );
  - userId = profile.email.split('@')[0];
  - }
  + const userId = profile.email.split('@')[0];
  const token = await ctx.tokenIssuer.issueToken({
  claims: { sub: userId, ent: [`user:default/${userId}`] },
  