Set name attribute on compute_subnetwork data source

[rileykarson]

Upstreams hashicorp/terraform-provider-google#5288

Release Note Template for Downstream PRs (will be copied)

compute: Fixed behaviour where `google_compute_subnetwork` did not record a value for `name` when `self_link` was specified.

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[rileykarson]

Changes are to third_party and no CLA is required.

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[modular-magician]

Hi! I'm the modular magician, I work on Magic Modules.
I see that this PR has already had some downstream PRs generated. Any open downstreams are already updated to your most recent commit, ae6ec04.

Pull request statuses

No diff detected in terraform-google-conversion.
No diff detected in Ansible.
No diff detected in Inspec.

New Pull Requests

I built this PR into one or more new PRs on other repositories, and when those are closed, this PR will also be merged and closed.
depends: hashicorp/terraform-provider-google-beta#1579
depends: hashicorp/terraform-provider-google#5305

[googlebot]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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