remove deprecated fields from certificate

[gfxcc]

Upgrade guide for #8531

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hello! I am a robot. It looks like you are a: Community Contributor Googler Core Contributor. Tests will run automatically.

@melinath, 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.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[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.

Terraform GA: Diff ( 1 file changed, 10 insertions(+))
Terraform Beta: Diff ( 1 file changed, 10 insertions(+))

[modular-magician]

Tests analytics

Total tests: 2960
Passed tests 2658
Skipped tests: 302
Affected tests: 0

$\textcolor{green}{\textsf{All tests passed in REPLAYING mode.}}$
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