FindFreetype: Revert use of upstream freetype cmake package

The upstream freetype cmake package uses generator expressions and
imported target to express its dependencies.  That's fine on its own.
However, our use of it since commit d83d925045 (FindFreetype: use
`freetype-config.cmake` if available, 2023-09-06, v3.28.0-rc1~130^2)
causes the `FREETYPE_LIBRARIES` result variable to reference those
imported targets and create a package-level dependency for clients that
did not exist previously.  Revert that change for now, along with its
follow-up fixes.  Further investigation will be needed to solve the
motivating use case another way.

Fixes: #25635

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