FindXCTest: Fix test module generation for Xcode 16

In Xcode 7.3 and above, the `TEST_HOST` setting causes Xcode to
implicitly place the test module inside the executable bundle regardless
of the module's own location settings.  Since commit a364d2513a (Xcode:
Fixup XCTest bundle location for Xcode 7.3, 2016-03-25, v3.5.2~6^2) we
explicitly tell CMake to put the test module in the same location so
that generator expressions used by `xctest_add_test` agree with where
Xcode actually puts it.  In Xcode 16 and above, our explicit location
settings for the test module conflict with Xcode's `TEST_HOST` rules,
causing errors about multiple commands producing the same path.

Fix this by dropping CMake's explicit location for the test module
unless needed to match a project-specified location for the testee.
Instead, teach `xctest_add_test` to express the xctest module location
selected by `TEST_HOST` by using generator expressions referencing the
testee bundle.

Fixes: #26301
Fixes: #26514

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