target_link_libraries: Restore LINK_ONLY for multiple static lib dependencies

Since commit c1e812ad4f (target_link_libraries: Improve tolerance of
unquoted generator expressions, 2022-02-15, v3.23.0-rc2~11^2) we
accumulate consecutive non-keyword arguments to recover an unquoted
generator expression as a single entry.  When given multiple consecutive
non-genex library names, the grouping breaks our logic that expects each
entry is either a raw target name or a genex.  Revise the logic to only
accumulate multiple arguments when they end inside a partial genex.

This bug caused `target_link_libraries` to stop wrapping static library
private dependencies in `$<LINK_ONLY:...>` for `INTERFACE_LINK_LIBRARIES`
when multiple consecutive library names are given.  Add a test case
covering that behavior.

Fixes: #23302

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