add stack_type attribute

[modular-magician]

Add stack_type attribute for google_compute_interconnect_attachment resource.

Note: Explicit test for this attribute cannot be added in examples because this attribute cannot be added for attachments of type PARTNER, attachments of type DEDICATED require interconnect to be specified, and there is no Terraform resource for creating an interconnect. Attachments of type PARTNER_PROVIDER cannot be created without being an approved partner.

Fixes: #17129

Release Note Template for Downstream PRs (will be copied)

compute: added `stack_type` attribute for `google_compute_interconnect_attachment` resource.

Derived from GoogleCloudPlatform/magic-modules#9890

[github-actions]

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