Fix fetching of app_engine_standard_app_version data

[pmarschik]

Release Note Template for Downstream PRs (will be copied)

appengine: added ability to fully sync `StandardAppVersion` resources

@megan07 I've tried to match the generated terraform output to my original PR hashicorp/terraform-provider-google#6388

I didn't try to add your suggested

      handlers: !ruby/object:Overrides::Terraform::PropertyOverride
        default_from_api: true

since I don't have any appengine versions with just the default handlers to try with.
Also I don't currently have FlexibleAppVersion resources setup in terraform to play around with.

Maybe this PR can serve as base for more changes.

References

• google_appengine_standard_version is missing properties on read hashicorp/terraform-provider-google#6417
• Fix fetching of app_engine_standard_app_version data hashicorp/terraform-provider-google#6388

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[modular-magician]

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

Diff report:

Terraform GA: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))
Terraform Beta: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))
TF Conversion: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))
Inspec: Diff ( 1 file changed, 1 insertion(+), 1 deletion(-))

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[megan07]

Looks great! Thanks for catching this and for fixing it! I've got the other changes coming in a PR after this gets merged. Thanks for your help!