In the same fashion as the previous commit ("ref-manual/packages: move
ptest section to the test-manual"), move the runtime testing section of
the development tasks manual to the test environment manual.
Add a link to it from the test-manual/intro document.
(From yocto-docs rev: 6b44257874858db3aa426d3e84a79c41cb4937a3)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
