WEB-1761 - anchor link checking

[davidejones]

What does this PR do?

Enables the internal hash checks on the link checking job. Previously enabling this functionality resulted in segfaults and the job failing.

Motivation

https://datadoghq.atlassian.net/browse/WEB-1761

Preview

https://gitlab.ddbuild.io/DataDog/documentation/-/jobs/132575461 https://docs-staging.datadoghq.com/david.jones/test-link/

Additional Notes

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Reviewer checklist

• [ ] Review the changed files.
• [ ] Review the URLs listed in the Preview section.
• [ ] Check images for PII
• [ ] Review any mentions of "Contact Datadog support" for internal support documentation.