Fix ApigeeOrganization update response type.

[modular-magician]

Fixes #15947.

This PR fixes the ApigeeOrganization update response type according to the public documentation.

The issue is related to the fact that after requesting the update to ApigeeOrganization here, the provider expects that the response will contain the Operation details to then wait for the Operation to complete here. Unlike Organization create request, which returns Operation, the update response is an Organization instance according to the public docs, meaning that the ApigeeOperationWaitTime tries to process the Organization as Operation.

The Operation has a name key that is used to track its progress. However, the Organization also has a name key, that contains the name of the Organization. That's why the users see a weird apigee.googleapis.com/v1/<org-name>?alt=json GET request in a linked GitHub issue. In that case, the ApigeeOperationWaitTime interprets <org-name> as the operation name.

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apigee: fixed error 404 for `organization` update requests.

Derived from GoogleCloudPlatform/magic-modules#12413