Support mockgcp for AnalyticsAccount

[maqiuyujoyce]

BRIEF Change description

Fixes part 1 of #5334

Note that:

1. Analytics API doesn't support gcloud so we can't have gcloud test for it. Though the mock code is already verified in Support AnalyticsAccount (Alpha) #5411. Splitting it out for review purposes.
2. We use the alpha version (googleapis/google/analytics/admin/v1alpha/*.proto) because only v1alpha is supported in the latest version of Cloud Go client (https://pkg.go.dev/cloud.google.com/go/[email protected]/admin/apiv1alpha), and the proto version needs to match the client code version in the mockgcp.

WHY do we need this change?

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[yuwenma]

Do you mean bumping the go mod in mockgcp (rather than the REPO_ROOT go.mod)?

[maqiuyujoyce]

Good point! Added the dependency in the mockgcp folder.

Tried to remove it from the root go.mod but it got added back automatically after make ensure so I assume that this indirect dependency is needed

[yuwenma]

Alpha is very experimental version. Suggest at least using v1beta?
https://developers.google.com/analytics/devguides/config/admin/v1/rpc/google.analytics.admin.v1beta

[maqiuyujoyce]

(Mentioned in description): We use the alpha version (googleapis/google/analytics/admin/v1alpha/*.proto) because only v1alpha is supported in the latest version of Cloud Go client (https://pkg.go.dev/cloud.google.com/go/[email protected]/admin/apiv1alpha), and the proto version needs to match the client code version in the mockgcp.

We can bump to v1beta once the Go client supports it.

[maqiuyujoyce]

Thanks for the review, @yuwenma . Comments addressed.

[maqiuyujoyce]

(Mentioned in description): We use the alpha version (googleapis/google/analytics/admin/v1alpha/*.proto) because only v1alpha is supported in the latest version of Cloud Go client (https://pkg.go.dev/cloud.google.com/go/[email protected]/admin/apiv1alpha), and the proto version needs to match the client code version in the mockgcp.

We can bump to v1beta once the Go client supports it.

[maqiuyujoyce]

Good point! Added the dependency in the mockgcp folder.

Tried to remove it from the root go.mod but it got added back automatically after make ensure so I assume that this indirect dependency is needed