bigqueryreservation: add labels field to google_bigquery_reservation

[joyan0930]

Fixes hashicorp/terraform-provider-google#25304.

This PR adds a labels field to the google_bigquery_reservation resource. The BigQuery Reservation v1 API already supports a labels map on the Reservation resource, but the Terraform provider does not expose it. Exposing labels enables cost allocation via billing export label filters when multiple teams' reservations are managed in a single admin project.

Changes

• mmv1/products/bigqueryreservation/Reservation.yaml: add labels (KeyValueLabels). The resource already uses update_mask: true / update_verb: PATCH, so labels, terraform_labels and effective_labels handling is fully generated with no custom code.
• bigquery_reservation_basic.tf.tmpl: add labels to the documented sample.
• resource_bigquery_reservation_test.go.tmpl: add TestAccBigqueryReservation_labels_update covering create → update → import (with ImportStateVerifyIgnore for labels/terraform_labels), following the pattern from eventarc: add labels field in channel resource #15463 (eventarc channel labels).

Local verification

• make provider VERSION=ga PRODUCT=bigqueryreservation succeeds; generated diff includes the labels schema, tpgresource.SetLabelsDiff, and labels in the PATCH update mask.
• go build, go vet, and gofmt pass on the generated google/services/bigqueryreservation package.

Note: an earlier draft of this change exists as jbbqqf#4, but it was only opened on a personal fork and has been inactive; this PR is a complete version including tests and docs.

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See Write release notes for guidance.

bigqueryreservation: added `labels` field to `google_bigquery_reservation` resource

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[github-actions]

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@malhotrasagar2212, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit 21e9df6:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	5 files changed, 197 insertions(+), 2 deletions(-)
google-beta provider	View Diff	5 files changed, 197 insertions(+), 2 deletions(-)
terraform-google-conversion	View Diff	1 file changed, 17 insertions(+)
Open in Cloud Shell	View Diff	1 file changed, 3 insertions(+)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
16	7	0	9

Affected Service Packages

• bigqueryreservation

Learn how VCR tests work

---

Step 1: Replaying Mode

Action taken

Found 9 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccBigqueryReservationReservationAssignment_bareNameWithoutLocation
• TestAccBigqueryReservationReservationAssignment_bigqueryReservationAssignmentBasicExample
• TestAccBigqueryReservationReservationAssignment_bigqueryReservationAssignmentFullExample
• TestAccBigqueryReservationReservation_bigqueryReservationBasicExample
• TestAccBigqueryReservationReservation_bigqueryReservationWithDisasterRecoveryExample
• TestAccBigqueryReservation_labels_update
• TestAccBigqueryReservation_reservationGroup_update
• TestAccBigqueryReservation_withDisasterRecovery_update
• TestAccBigqueryReservation_withScalingMode_update

View the replaying VCR build log

---

Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccBigqueryReservationReservationAssignment_bareNameWithoutLocation
✅ Log	✅	TestAccBigqueryReservationReservationAssignment_bigqueryReservationAssignmentBasicExample
✅ Log	✅	TestAccBigqueryReservationReservationAssignment_bigqueryReservationAssignmentFullExample
✅ Log	✅	TestAccBigqueryReservationReservation_bigqueryReservationBasicExample
✅ Log	✅	TestAccBigqueryReservationReservation_bigqueryReservationWithDisasterRecoveryExample
✅ Log	✅	TestAccBigqueryReservation_labels_update
✅ Log	✅	TestAccBigqueryReservation_reservationGroup_update
✅ Log	✅	TestAccBigqueryReservation_withDisasterRecovery_update
✅ Log	✅	TestAccBigqueryReservation_withScalingMode_update

🟢 All tests passed!

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

@joyan0930, @sachinpro, @malhotrasagar2212 VCR tests complete for 21e9df6!