Privacy: Include session tokens in Personal Data Export.

Session tokens contain an IP address and user agent.

Props garrett-eclipse, nickylimjj, lakenh, xkon, rconde.
Fixes #45889.
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git-svn-id: https://core.svn.wordpress.org/trunk@47037 1a063a9b-81f0-0310-95a4-ce76da25c4cd