Iam support dataplex data product

[modular-magician]

Description

This PR adds support for standard IAM resources (iam_policy, iam_binding, and iam_member) and the optional access_approval_config field to the google_dataplex_data_product resource.

Key Changes

• IAM Support: Added the iam_policy block to DataProduct.yaml to enable declarative permission management.
• Field Alignment: Introduced an output-only name property to the parent resource to provide the full resource path required for IAM identity validation.
• Approval Workflow:: Added the access_approval_config property to allow producers to define approver emails.

Verification Performed

• Manual verification was performed in the okvidhi-testing project using provider developer overrides. Successful creation and update of the Data Product with a service account principal and approver email was verified in the Google Cloud Console.

dataplex: added IAM support for `google_dataplex_data_product` (iam_policy, iam_binding, iam_member)

dataplex: added `access_approval_config` field to `google_dataplex_data_product`

Derived from GoogleCloudPlatform/magic-modules#17775