Add support for Sphinx 4.4.0

• need support for suppression of extlink warnings https://github.com/sphinx-doc/sphinx/pull/10123
• need to enable them
• need this to be fixed: https://github.com/sphinx-doc/sphinx/issues/10124 to resolve "WARNING: more than one target found for cross-reference"

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Migrated from T3872 (view on Phabricator)