Remove generated OAuth scope test report from the demo

oauth-scope-test-report.md is output generated by
scripts/test-oauth-scopes.sh against a running demo stack, not source.
It does not belong in the repository.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Tim Bloomfield <tim.bloomfield@ontario.ca>

Author: timbl-ont