Make SourceTextData thread-safe with ConcurrentDictionary - #20113

Unhandled error: HttpError: Validation Failed: {"resource":"IssueComment","code":"unprocessable","field":"data","message":"Body cannot be blank"}

Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step.