Disable the qtest-aarch64/migration-test, which sometimes fail
non-deterministically (see:
https://gitlab.com/qemu-project/qemu/-/issues/1230).

Also disable the bios-tables-test, which may fail on older machines (see:
https://gitlab.com/qemu-project/qemu/-/issues/1098).

--- qemu-8.1.0/tests/qtest/meson.build.old	2023-08-30 11:48:27.871146249 -0400
+++ qemu-8.1.0/tests/qtest/meson.build	2023-08-30 13:53:25.994084948 -0400
@@ -1,6 +1,5 @@
 slow_qtests = {
   'ahci-test' : 60,
-  'bios-tables-test' : 120,
   'boot-serial-test' : 60,
   'migration-test' : 150,
   'npcm7xx_pwm-test': 150,
@@ -81,9 +80,6 @@
    config_all_devices.has_key('CONFIG_Q35') and                                             \
    config_all_devices.has_key('CONFIG_VIRTIO_PCI') and                                      \
    slirp.found() ? ['virtio-net-failover'] : []) +                                          \
-  (unpack_edk2_blobs and                                                                    \
-   config_all_devices.has_key('CONFIG_HPET') and                                            \
-   config_all_devices.has_key('CONFIG_PARALLEL') ? ['bios-tables-test'] : []) +             \
   qtests_pci +                                                                              \
   qtests_cxl +                                                                              \
   ['fdc-test',
@@ -212,7 +208,6 @@

 # TODO: once aarch64 TCG is fixed on ARM 32 bit host, make bios-tables-test unconditional
 qtests_aarch64 = \
-  (cpu != 'arm' and unpack_edk2_blobs ? ['bios-tables-test'] : []) +                            \
   (config_all.has_key('CONFIG_TCG') and config_all_devices.has_key('CONFIG_TPM_TIS_SYSBUS') ?            \
     ['tpm-tis-device-test', 'tpm-tis-device-swtpm-test'] : []) +                                         \
   (config_all_devices.has_key('CONFIG_XLNX_ZYNQMP_ARM') ? ['xlnx-can-test', 'fuzz-xlnx-dp-test'] : []) + \
@@ -222,8 +217,7 @@
    config_all_devices.has_key('CONFIG_TPM_TIS_I2C') ? ['tpm-tis-i2c-test'] : []) + \
   ['arm-cpu-features',
    'numa-test',
-   'boot-serial-test',
-   'migration-test']
+   'boot-serial-test']

 qtests_s390x = \
   qtests_filter + \
@@ -301,7 +295,6 @@
 endif

 qtests = {
-  'bios-tables-test': [io, 'boot-sector.c', 'acpi-utils.c', 'tpm-emu.c'],
   'cdrom-test': files('boot-sector.c'),
   'dbus-vmstate-test': files('migration-helpers.c') + dbus_vmstate1,
   'erst-test': files('erst-test.c'),