Implement compute instance groups plural datasource

[olpapchenko]

Fixes hashicorp/terraform-provider-google#18941

`google_compute_instance_groups`

[github-actions]

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

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 51219e0:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	2 files changed, 211 insertions(+)
google-beta provider	View Diff	2 files changed, 211 insertions(+)

Missing doc report (experimental)

The following data sources are missing documents:

• google_compute_instance_groups, expect file /website/docs/d/compute_instance_groups.html.markdown to exist.

Test report

Analytics

Total Tests	Passed	Skipped	Affected
1473	1379	93	1

Affected Service Packages

• compute

Learn how VCR tests work

---

Step 1: Replaying Mode

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccDataSourceGoogleComputeInstanceGroups

View the replaying VCR build log

---

Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccDataSourceGoogleComputeInstanceGroups

🟢 All tests passed!

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

@olpapchenko, @roaks3 VCR tests complete for 51219e0!

[roaks3]

Very high-level initial comment, but I think we'd want a documentation page for this?

[olpapchenko]

Very high-level initial comment, but I think we'd want a documentation page for this?

Added documentation.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 670d89a:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	3 files changed, 283 insertions(+)
google-beta provider	View Diff	3 files changed, 283 insertions(+)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
1473	1380	93	0

Affected Service Packages

• compute

Learn how VCR tests work

---

Step 1: Replaying Mode

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

View the replaying VCR build log

@olpapchenko, @roaks3 VCR tests complete for 670d89a!