chore: remove cloud optimization as it has been deprecated

[sofisl]

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Fixes #<issue_number_goes_here> 🦕

[snippet-bot]

Here is the summary of changes.

You are about to delete 3 region tags.

• packages/google-cloud-optimization/samples/generated/v1/fleet_routing.batch_optimize_tours.js:24, tag cloudoptimization_v1_generated_FleetRouting_BatchOptimizeTours_async
• packages/google-cloud-optimization/samples/generated/v1/fleet_routing.optimize_tours.js:24, tag cloudoptimization_v1_generated_FleetRouting_OptimizeTours_async
• packages/google-cloud-optimization/samples/quickstart.js:15, tag cloudoptimization_v1_generated_FleetRouting_BatchOptimizeTours_async

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