`acceleratorconfig` and `acceleratorrdma` suites both fail due it defaulting to `n1-standard-1`

[kajiya3141]

I've added example logs of both suites here for completeness, but I believe it's simply a case of forcing the relevant machine types for these two suites (or having an accelerator-specific DefaultMachineType override value in fixtures.go).

acceleratorrdma

<?xml version="1.0" encoding="UTF-8"?>
<testsuites time="0.000" tests="2" failures="2">
<testsuite name="acceleratorrdma-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622" tests="2" failures="2" errors="0" id="0" time="0.000">
  <testcase name="TestGPUDirectRDMAHost" classname="acceleratorrdma-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622">
      <failure message="" type="Failure"><![CDATA[step "create-vms" run error: googleapi: Error 400: hyperdisk-balanced disk type cannot be used by n1-standard-1 machine type., badRequest]]></failure>
  </testcase>
  <testcase name="TestGPUDirectRDMAClient" classname="acceleratorrdma-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622">
      <failure message="" type="Failure"><![CDATA[step "create-vms" run error: googleapi: Error 400: hyperdisk-balanced disk type cannot be used by n1-standard-1 machine type., badRequest]]></failure>
  </testcase>
</testsuite>
</testsuites>

acceleratorconfig

<?xml version="1.0" encoding="UTF-8"?>
<testsuites time="0.000" tests="5" failures="5">
<testsuite name="acceleratorconfig-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622" tests="5" failures="5" errors="0" id="0" time="0.000">
  <testcase name="TestGpuCount" classname="acceleratorconfig-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622">
      <failure message="" type="Failure"><![CDATA[step "create-vms" run error: googleapi: Error 400: hyperdisk-balanced disk type cannot be used by n1-standard-1 machine type., badRequest]]></failure>
  </testcase>
  <testcase name="TestNicCount" classname="acceleratorconfig-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622">
      <failure message="" type="Failure"><![CDATA[step "create-vms" run error: googleapi: Error 400: hyperdisk-balanced disk type cannot be used by n1-standard-1 machine type., badRequest]]></failure>
  </testcase>
  <testcase name="TestNICNaming" classname="acceleratorconfig-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622">
      <failure message="" type="Failure"><![CDATA[step "create-vms" run error: googleapi: Error 400: hyperdisk-balanced disk type cannot be used by n1-standard-1 machine type., badRequest]]></failure>
  </testcase>
  <testcase name="TestGPUNumaMapping" classname="acceleratorconfig-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622">
      <failure message="" type="Failure"><![CDATA[step "create-vms" run error: googleapi: Error 400: hyperdisk-balanced disk type cannot be used by n1-standard-1 machine type., badRequest]]></failure>
  </testcase>
  <testcase name="TestNICNumaMapping" classname="acceleratorconfig-daily-ubuntu-accelerator-2204-amd64-with-nvidia-570-v20250622">
      <failure message="" type="Failure"><![CDATA[step "create-vms" run error: googleapi: Error 400: hyperdisk-balanced disk type cannot be used by n1-standard-1 machine type., badRequest]]></failure>
  </testcase>
</testsuite>
</testsuites>

[drewhli]

@jjerger Can you help take a look at this?