kselftests: Add gcc-10-plugin-dev package to Debian containers (only GCC ones)

[musamaanjum]

gcc-10-plugin-dev package is needed in Debian userspace for enabling GCC_PLUGIN_STACKLEAK config in the kernel. This config is needed in kernel for tools/testing/selftests/LKDTM/STACKLEAK_ERASING.sh test. At this time if we add gcc-10-plugin-dev package to the Bullseye and enable GCC_PLUGIN_STACKLEAK config. Kernel compilation fails:

/usr/lib/gcc/x86_64-linux-gnu/10/plugin/include/config/i386/i386.h:2500:10: fatal error: common/config/i386/i386-cpuinfo.h: No such file or directory
 2500 | #include "common/config/i386/i386-cpuinfo.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Looking at this error, I've found out that support for GCC Plugins is broken in Bullseye. There is a bug filed here. The workaround is possible by applying a patch. But I don't think that it is worthwhile. Let's wait for the bug to get fixed in Bullseye or wait for a new stable Debian release with this error fixed and KernelCI starts using that new Debian version. Then gcc-10-plugin-dev package should be added to the build Docker containers of GCC versions like gcc-10_x86 etc.

[musamaanjum]

After merging #1078 and in-review patch: https://lore.kernel.org/linux-kselftest/20220217205620.2512094-1-usama.anjum@collabora.com/t/#u, this issue is fixed. There is no need to do anything else. I've tested it in the local environment.