Add google_compute_service_attachments plural data source

[vr-ibm]

Fixes hashicorp/terraform-provider-google#23397

Adds a new plural data source google_compute_service_attachments that lists all service attachments in a given project and region, enabling discovery without hardcoding names or self_links.

Details

• Calls the serviceAttachments.list compute API with pagination support
• Accepts optional project, region, and filter arguments
• Returns a service_attachments list with key attributes: name, self_link, target_service, connection_preference, nat_subnets, enable_proxy_protocol, domain_names, fingerprint, region
• Adds acceptance test TestAccDataSourceGoogleComputeServiceAttachments_basic
• Adds documentation

Tests

TestAccDataSourceGoogleComputeServiceAttachments_basic

Release Note Template for Downstream PRs (will be copied)

`google_compute_service_attachments`

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit cc812dd:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	3 files changed, 417 insertions(+)
google-beta provider	View Diff	3 files changed, 417 insertions(+)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
1548	1450	95	3

Affected Service Packages

• compute

Learn how VCR tests work

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Step 1: Replaying Mode

Action taken

Found 3 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccComputeInstanceFromMachineImage_diffProject
• TestAccComputeReservation_reservationSharingPolicyExample
• TestAccDataSourceGoogleComputeServiceAttachments_basic

View the replaying VCR build log

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Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccDataSourceGoogleComputeServiceAttachments_basic
❌ Error · Log	-	TestAccComputeInstanceFromMachineImage_diffProject
❌ Error · Log	-	TestAccComputeReservation_reservationSharingPolicyExample

Caution

Issues requiring attention before PR completion

🔴 Initial Recording Failed: Some tests failed during the recording step. See the table above for details.

Please address these issues to complete your PR. If you believe these detections are incorrect or unrelated to your change, please raise the concern with your reviewer.

View the recording VCR build log or the debug logs folder for detailed results.

@vr-ibm VCR tests complete for cc812dd!