LINK_LIBRARIES_STRATEGY: Rename strategies to clarify expectations

Since commit 7abd3137b7 (Linking: Optionally reorder direct dependencies
from LINK_LIBRARIES, 2024-09-19, v3.31.0-rc1~53^2) the strategy name
`PRESERVE_ORDER` has led users to expect that it strictly preserves
order.  While the part of the link line generation logic controlled by
`LINK_LIBRARIES_STRATEGY` does preserve order, it is not the last step.
Toolchain-specific de-duplication can cause the order to change on the
actual link line generated in the build system.

Rename the strategies:

* `PRESERVE_ORDER` => `REORDER_MINIMALLY`
* `REORDER`        => `REORDER_FREELY`

The new names make it clear that reordering is always possible, just to
varying degrees.  Update the `LINK_LIBRARIES_STRATEGY` documentation to
clarify that the strategies do not directly control the final link line.

Fixes: #26400
Issue: #26271

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