fix(tools): preserve configured content_types in GithubSearchTool - #8908

Canceling since a higher priority waiting request for ftc-require-issue-8908 exists

The operation was canceled.

Canceling since a higher priority waiting request for ftc-require-issue-8908 exists

On December 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target