Show days deleted posts will be left for in trash

[aslamdoctor]

Trac ticket: https://core.trac.wordpress.org/ticket/61511

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

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Props aslamdoctor.

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[aslamdoctor]

@Debarghya-Banerjee I created this as a fresh PR as I did some mistakes in previous one by including huge set of commits and had to close it.

[github-actions]

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