feat(networkservices): add DNS peering config to AgentGateway:

[JamesDuncanNz]

Adds the dnsPeeringConfig nested object under privateConnectivity.egress
on google_network_services_agent_gateway, allowing users to specify
domains, targetProject, and targetNetwork so the gateway resolves
queries via Cloud DNS in a peered VPC.

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networkservices: added `dns_peering_config` field to `google_network_services_agent_gateway` resource (beta)

[github-actions]

Googlers: For automatic test runs see go/terraform-auto-test-runs.

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[melinath]

/gcbrun

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit b5d3fbd:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	1 file changed, 30 insertions(+)
google-beta provider	View Diff	5 files changed, 164 insertions(+)
terraform-google-conversion	View Diff	1 file changed, 55 insertions(+)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
101	95	6	0

Affected Service Packages

• networkservices

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🟢 All tests passed in Replaying mode! No Recording was needed.

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@JamesDuncanNz, @melinath VCR tests complete for b5d3fbd!