[New Data Source] aws_grafana_workspaces

[jfsanchez91]

Description

This PR introduces a new data source: aws_grafana_workspaces. It allows users to query AWS Managed Grafana workspaces by name or fetch all available workspaces in a region.
Returns:

• List of matching workspace names (names)
• List of corresponding workspace IDs (workspace_ids)

Relations

Closes #35194

Output from Acceptance Testing

% make testacc TESTARGS='-run=TestAccGrafanaWorkspacesDataSource_' PKG=grafana ACCTEST_PARALLELISM=1
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.9 test ./internal/service/grafana/... -v -count 1 -parallel 1  -run=TestAccGrafanaWorkspacesDataSource_ -timeout 360m -vet=off
2025/05/24 04:08:52 Initializing Terraform AWS Provider...
=== RUN   TestAccGrafanaWorkspacesDataSource_basic
--- PASS: TestAccGrafanaWorkspacesDataSource_basic (346.91s)
=== RUN   TestAccGrafanaWorkspacesDataSource_name
--- PASS: TestAccGrafanaWorkspacesDataSource_name (304.63s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/grafana    651.619s

[github-actions]

Community Guidelines

This comment is added to every new Pull Request to provide quick reference to how the Terraform AWS Provider is maintained. Please review the information below, and thank you for contributing to the community that keeps the provider thriving! 🚀

Voting for Prioritization

• Please vote on this Pull Request by adding a 👍 reaction to the original post to help the community and maintainers prioritize it.
• Please see our prioritization guide for additional information on how the maintainers handle prioritization.
• Please do not leave +1 or other comments that do not add relevant new information or questions; they generate extra noise for others following the Pull Request and do not help prioritize the request.

Pull Request Authors

• Review the contribution guide relating to the type of change you are making to ensure all of the necessary steps have been taken.
• Whether or not the branch has been rebased will not impact prioritization, but doing so is always a welcome surprise.