upstream: Move clearing TLS session from prepare phase to destroy phase [Backport to 4.0]

[cosmo0920]

Backporting from #10886.

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Testing
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Backporting

• Backport to latest stable release.

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✨ Finishing touches

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• Commit unit tests in branch cosmo0920-keep-tls-connection-after-completion-of-destroy-4.0

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