selftest/meta_ide: add a test for running SDK tests directly in a yocto build

There's been a recent discussion about how we can make the Yocto SDK
experience better [1]. One of the ideas was to eliminate the SDK
as a separate artefact altogether and simply provide everything
that the SDK and eSDKs do directly in a yocto build. This does not
mean that people have to 'learn Yocto', but rather that the integrators
should provide a well-functioning sstate cache infrastructure (same as
with minimal eSDK, really), and a few wrapper scripts for setting up the build
and the SDK environment that run layer setup and bitbake behind the scenes.

[1] https://lists.openembedded.org/g/openembedded-architecture/topic/thoughts_on_the_esdk/90990557

So without further ado, here's how you get a 'SDK' without building one:

1. Set up all the needed layers and a yocto build directory.

2. Run:
$ bitbake meta-ide-support
$ bitbake -c populate_sysroot gtk+3
(or any other target or native item that the application developer would need)
$ bitbake populate-sysroots

3. Set up the SDK environment:
. tmp/deploy/images/qemux86-64/environment-setup-core2-64-poky-linux
(adjust accordingly)

Et voila! The Unix environment is now set up to use the cross-toolchain from
Yocto, exactly as in the SDK. And devtool/bitbake are available to extend it,
exactly as in the eSDK.

Theare are numerous benefits here: no need to produce, test, distribute and maintain
separate SDK artifacts. No two separate environments for the yocto build and the SDK.
Less code paths where things can go wrong. Less awkward, gigantic tarballs. Less
SDK update headaches: 'updating the SDK' simply means updating the yocto layers with
git fetch or layer management tooling. Built-in SDK extensibility: just run bitbake
again to add more things to the sysroot, or add layers if even more things are required.

How is this tested?

Exactly same as the regular SDK:
$ bitbake -c testsdk meta-ide-support

This runs the same toolchain tests from meta/lib/oeqa/sdk/cases as the regular
sdk testing does.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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