[GH-8471] Deprecate Partial DQL syntax and forcing partial loads.

[beberlei]

Deprecates when you SELECT PARTIAL and when you use the query hint Query::HINT_FORCE_PARTIAL_LOAD.

Fixes #8471

[SenseException]

Should the message contain the SELECT NEW alternative that can replace partial objects?

[beberlei]

@SenseException My idea would be that people click the link, which then shows the alternative. Its not so easy to explain in the short space available for the message.

[SenseException]

What if we keep that information in the documentation? Your current doc-changes don't contain the alternative and I would expect to find it there if not in a deprecation message.