Add volatile status fields from google_tpu_v2_vm to ISVI

[rileykarson]

Fixes hashicorp/terraform-provider-google#16957 (we should refile if we get a new one after)

    resource_tpu_v2_vm_test.go:21: Step 6/6 error running import: ImportStateVerify attributes not equivalent. Difference is shown below. The - symbol indicates attributes missing after import.
          map[string]string{
        -   "health":             "TIMEOUT",
        +   "health":             "UNHEALTHY_MAINTENANCE",
        -   "health_description": "",
        +   "health_description": "The TPU had a maintenance event at 2025-04-23T07:43:36.67877072Z",
          }

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google-beta provider: Diff ( 1 file changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 7
Passed tests: 3
Skipped tests: 4
Affected tests: 0

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• tpuv2

🟢 All tests passed!

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