compute: update tdx tests to use standard images

[wyardley]

It seems like the fix in #12062 may not have fixed the images relying on Ubuntu images in the tdx-guest-images project.

I'm not sure if this is the right fix, but running one of the affected tests seemed to work for me (and the UI showed confidential mode enabled), so maybe this support is now available in the mainstream image?

Added a comment with more context here:
hashicorp/terraform-provider-google#19885 (comment)
but seems like this may just be natively supported in the stock Ubuntu images now.

Part of hashicorp/terraform-provider-google#19885

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[github-actions]

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@shuyama1, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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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 provider: Diff ( 4 files changed, 4 insertions(+), 4 deletions(-))
google-beta provider: Diff ( 5 files changed, 5 insertions(+), 5 deletions(-))

[modular-magician]

Tests analytics

Total tests: 1044
Passed tests: 966
Skipped tests: 73
Affected tests: 5

Click here to see the affected service packages

• compute

Action taken

Found 5 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccComputeInstanceConfidentialInstanceConfigMain
• TestAccComputeInstanceFromMachineImage_confidentialInstanceConfigMain
• TestAccComputeInstanceFromTemplate_confidentialInstanceConfigMain
• TestAccComputeInstanceTemplate_ConfidentialInstanceConfigMain
• TestAccComputeRegionInstanceTemplate_ConfidentialInstanceConfigMain

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccComputeInstanceConfidentialInstanceConfigMain [Debug log]
TestAccComputeInstanceFromMachineImage_confidentialInstanceConfigMain [Debug log]
TestAccComputeInstanceFromTemplate_confidentialInstanceConfigMain [Debug log]
TestAccComputeInstanceTemplate_ConfidentialInstanceConfigMain [Debug log]
TestAccComputeRegionInstanceTemplate_ConfidentialInstanceConfigMain [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test