mockgcp: support for LoggingLogBucket

[justinsb]

• tests: captured test output for projectlogbucket
• mockgcp: add support for LoggingLogBucket
• mockgcp: Allow services to rewrite errors for accurate golden testing

[justinsb]

/assign @acpana

(Also ... ask me for the backstory here!)

[acpana]

This LGTM overall but I think the test harness is coming to our rescue! Digging into the logs I see that test failures for

* 1. TestAllInSeries/samples/organization-log-bucket
* 2. TestAllInSeries/samples/billing-account-log-bucke

may actually be genuine:

1.  Error 400: name \"organizations/123450001/locations/global/buckets/_Default\" is not valid"}
2. .. resource reference is missing required 'name' field"} ...

sample run: https://github.com/GoogleCloudPlatform/k8s-config-connector/actions/runs/8648481995/job/23786979096?pr=1545

[justinsb]

Rebased and added more of the cases covered in our samples to mockgcp!

[acpana]

thanks for following up here 🥇 🙏🏼

/lgtm
/approve

[google-oss-prow]

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