Meta: Remove microvm machine type from run.py

Running in the microvm doesn't work anymore, since we removed IDE
support. Currently, we only support PCI(e)-attached storage devices,
which are not compatible with the microvm, as it doesn't support PCI(e)
at all.

Meta/run.py

@@ -62,7 +62,6 @@ class MachineType(Enum):
     QEMUGrub = "qgrub"
     CI = "ci"
     Limine = "limine"
-    MicroVM = "microvm"
 
     def uses_grub(self) -> bool:
         return self in [MachineType.QEMU35Grub, MachineType.QEMUGrub]
@@ -617,11 +616,6 @@ def set_up_boot_drive(config: Configuration):
     if provided_virtio_block_enable is not None:
         config.virtio_block_enable = provided_virtio_block_enable == "1"
 
-    if config.machine_type in [MachineType.MicroVM]:
-        if config.nvme_enable:
-            print("Warning: NVMe does not work under MicroVM, automatically disabling it.")
-        config.nvme_enable = False
-
     if config.architecture == Arch.Aarch64:
         config.boot_drive = f"file={config.disk_image},if=sd,format=raw,id=disk"
     elif config.nvme_enable:
@@ -765,16 +759,6 @@ def set_up_machine_devices(config: Configuration):
         )
         config.character_devices.append("stdio,id=stdout,mux=on")
         config.enable_usb = True
-    elif config.machine_type in [MachineType.MicroVM]:
-        config.character_devices.append("stdio,id=stdout,mux=on")
-        config.qemu_cpu = "qemu64"
-        config.qemu_machine = "microvm,pit=on,rtc=on,pic=on"
-        config.cpu_count = None
-        config.display_device = None
-        config.network_default_device = None
-        config.audio_devices = []
-        config.add_devices(["isa-debugcon,chardev=stdout", "isa-vga", "ne2k_isa,netdev=breh"])
-        config.add_devices(["isa-ide", "ide-hd,drive=disk", "i8042"])
 
     elif config.machine_type == MachineType.CI:
         config.display_backend = "none"