HPCC-8738 Delete the original embedding examples

Now that embedding support is fully built-in, remove the original examples
that did it the hard way.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #3930 from richardkchapman/kill-old-examples

HPCC-8738 Delete the original embedding examples

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>