Improve mws_workspaces data source

[kishaningithub]

Changes

Addresses https://github.com/databricks/terraform-provider-databricks/issues/1865#issuecomment-3014079353

Tests

• [x] make test run locally
• [x] relevant change in docs/ folder
• [x] covered with integration tests in internal/acceptance
• [x] using Go SDK
• [x] using TF Plugin Framework
• [x] has entry in NEXT_CHANGELOG.md file

[kishaningithub]

@tanmay-db Have completed addressing all the items in the PR check list. Kindly review the PR and let me know if further changes are required.

[github-actions[bot]]

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• PR number: 5100
• Commit SHA: a6e9776bd848129b609f83f7107311849bb54e67

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