[CCM]: Release notes for 1.66.0

[joeyouss]

This pull request updates the Cloud Cost Management release notes with several new features, improvements, and bug fixes for version 1.66.0. The most significant changes include the migration to LabelsV2 for improved performance, enhanced bulk management and filtering capabilities for budgets, and various feature improvements

• Successful preview build.
• Code owner review.
• No merge conflicts.
• Release notes/new features docs: Feature/version released to at least one prod environment.

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