CI: extend target tests (IEC-171)

[igrr]

Currently we run tests on esp32 only.

• Run target test jobs on more chips, where relevant (e.g. 1 Xtensa and one RISC-V chip)
• Add test parametrization by chip targets, using pytest.mark.parametrize over target parameter

  @pytest.mark.parametrize('target', [
      'esp32',
      'esp32s2',
  ])
  def test_a():
      pass
  
  # pytest --add-target-as-marker=y -m "esp32"
  

• Revisit build-test-rules files, remove unnecessary builds
• Add job to run tests in QEMU
• Move some target tests to QEMU