kci: Add tests in forecasting

[nuclearcat]

We can show in forecast test names, labs and platforms.
Command remain same:
kci config forecast -c ../kernelci-pipeline/config/

For example:

Checkout: vireshk:for-kernelci
Identical builds: <<skipped>>

  Number of builds: 18
  Builds:
    - kbuild-clang-17-arm
      Number of tests: 0
    - kbuild-clang-17-x86
      Number of tests: 0
    - kbuild-gcc-12-arm
      Number of tests: 24
      - baseline-arm (lava-collabora) ['imx6q-sabrelite', 'odroid-xu3', 'rk3288-rock2-square', 'rk3288-veyron-jaq']
      - baseline-arm-baylibre (lava-baylibre) ['am57xx-beagle-x15', 'at91-sama5d4_xplained', 'beagle-xm', 'beaglebone-black', 'da850-lcdk', 'jetson-tk1', 'mt7629-rfb', 'sun7i-a20-cubieboard2
']
      - baseline-arm-broonie (lava-broonie) ['beaglebone-black', 'imx6dl-udoo', 'imx6q-udoo', 'stm32mp157a-dhcor-avenger96']
      - baseline-arm-clabbe (lava-clabbe) ['armada-388-clearfog-pro', 'jetson-tk1', 'sun7i-a20-cubieboard2', 'sun8i-a33-olinuxino', 'sun8i-a83t-bananapi-m3', 'sun8i-h2-plus-orangepi-r1', 'su
n8i-h2-plus-orangepi-zero', 'sun8i-h3-orangepi-pc', 'sun8i-r40-bananapi-m2-ultra', 'sun9i-a80-cubieboard4']
<<...skipped...>>

Fixes: #2936