Add InstanceMetadata field to google_workstations_workstation_config resource

[batldre-bot]

workstations: added `instance_metadata` field to `google_workstations_workstation_config` resource

[github-actions]

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

@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.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit cbd6883:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	4 files changed, 178 insertions(+), 1 deletion(-)
google-beta provider	View Diff	4 files changed, 178 insertions(+), 1 deletion(-)
terraform-google-conversion	View Diff	1 file changed, 18 insertions(+)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
43	39	0	4

Affected Service Packages

• workstations

Learn how VCR tests work

---

Step 1: Replaying Mode

Action taken

Found 4 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccWorkstationsWorkstationConfig_instanceMetadata
• TestAccWorkstationsWorkstationConfig_instanceMetadataUpdate
• TestAccWorkstationsWorkstationConfig_update
• TestAccWorkstationsWorkstationConfig_updateHostDetails

View the replaying VCR build log