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Include suffixlist private domains

BCornwall requested to merge T378152-jp-net-tld-private-suffixes into main

As mentioned on the tldextract wiki [1], the PSL maintains a concept of "private" domains:

PRIVATE domains are amendments submitted by the domain holder, as an
expression of how they operate their domain security policy. … While
some applications, such as browsers when considering cookie-setting,
treat all entries the same, other applications may wish to treat
ICANN domains and PRIVATE domains differently.

This would cause e.g. "jp.net" to be detected as a suffix of ".net" and domain of "jp", which is not what we want. As a result, "wikipedia.jp.net" was being incorrectly categorized as a subdomain.

[1] https://github.com/john-kurkowski/tldextract/?tab=readme-ov-file#public-vs-private-domains

Closes T378152

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