fix(apigee): Error of update in google_apigee_developer

[modular-magician]

• fix: https://github.com/hashicorp/terraform-provider-google/issues/20226
• Modified update_mask in mmv1 to follow the docs
• Added update test for google_apigee_developer

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apigee: fixed error of update in `google_apigee_developer` resource

Derived from https://github.com/GoogleCloudPlatform/magic-modules/pull/12347