Add certificate template field to privateca Certificate

[nat-henderson]

Now that privateca certificate template is present in TF.

Also adds test - which will only successfully run in CI since it depends on a static CA pool.

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

(note that tests will have to run on this PR overnight, since the privateca resources are hard to test and depend on a certificate pool that's set up statically).

Fixes hashicorp/terraform-provider-google#9792.

Release Note Template for Downstream PRs (will be copied)

`privateca`: Added `certificate_template` to `google_privateca_certificate`.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 315 insertions(+))
Terraform Beta: Diff ( 4 files changed, 316 insertions(+), 1 deletion(-))
TF Conversion: Diff ( 1 file changed, 10 insertions(+))

[nat-henderson]

Hm, well, it compiles, but seems to have failed to trigger recording mode. Odd.
/gcbrun
We'll rerun and see what happens.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 315 insertions(+))
Terraform Beta: Diff ( 4 files changed, 316 insertions(+), 1 deletion(-))
TF Conversion: Diff ( 1 file changed, 10 insertions(+))

[modular-magician]

Error trying to cancel build ()

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccComposerEnvironment_update|TestAccComposerEnvironment_withSoftwareConfig|TestAccPrivatecaCertificate_privatecaCertificateWithTemplateExample|TestAccPrivatecaCaPool_privatecaCapoolEmptyBaseline|TestAccPrivatecaCertificateTemplate_BasicCertificateTemplate You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=202788

[modular-magician]

Tests failed during RECORDING mode: TestAccPrivatecaCaPool_privatecaCapoolEmptyBaseline|TestAccPrivatecaCertificate_privatecaCertificateWithTemplateExample|TestAccComposerEnvironment_withSoftwareConfig|TestAccComposerEnvironment_update Please fix these to complete your PR

[nat-henderson]

Ahh... I think I've got it - the field needs comparison ignoring project number / name disparities.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 3 files changed, 315 insertions(+))
Terraform Beta: Diff ( 3 files changed, 315 insertions(+))
TF Conversion: Diff ( 1 file changed, 10 insertions(+))

[nat-henderson]

Great, that test passes here now:

https://ci-oss.hashicorp.engineering/buildConfiguration/GoogleCloudBeta_ProviderGoogleCloudBetaMmUpstream/202815?buildTab=tests&status=passed

[slevenick]

Looks reasonable to me!