cloud: add info about the Recycle Bin support for Essential

[qiancai]

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revert: #22750

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[gemini-code-assist]

Code Review

This pull request updates the TiDB Cloud documentation to reflect that Essential instances now support the Recycle Bin feature. It adds a new "Restore from Recycle Bin" section to the serverless backup and restore guide, updates the cluster deletion guide, updates the feature support matrix, and updates the glossary. The review comments provide actionable suggestions to improve grammar, ensure consistent capitalization of "the Recycle Bin", use the hyphenated adjective "backed-up", and remove unnecessary words for better conciseness.

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[LGTM Timeline notifier]

Timeline:

• 2026-06-05 03:02:05.696064241 +0000 UTC m=+497026.766381621: ☑️ agreed by hfxsd.

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