chore: Make any instances acceptable in fingerprint test

Similar to other buildkite pipeline generation script, we would like to
inject an onboarding instance type via --instances arg.

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86

.buildkite/pipeline_cpu_template.py

@@ -34,7 +34,6 @@ class BkStep(str, Enum):
             "tools/devtool -y test --no-build -- -m no_block_pr integration_tests/functional/test_cpu_template_helper.py -k test_guest_cpu_config_change",
         ],
         BkStep.LABEL: "🖐️ fingerprint",
-        "instances": DEFAULT_INSTANCES,
         "platforms": DEFAULT_PLATFORMS,
     },
     "cpuid_wrmsr": {