Added last updated details of plugins

[benazeer-ben]

Trac ticket: https://core.trac.wordpress.org/ticket/62332

Description

This PR adds last updated details of the plugins.

Expected behaviour

On the plugin listing page, a new column titled "Last Updated" will be displayed, showing the date of the most recent update.

Screenshots/Screencasts

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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]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core Committers: Use this line as a base for the props when committing in SVN:

Props benazeer.

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[github-actions]

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The changes in this pull request can previewed and tested using a WordPress Playground instance.

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Some things to be aware of

• The Plugin and Theme Directories cannot be accessed within Playground.
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• A fresh instance is created each time the link below is clicked.
• Every time this pull request is updated, a new ZIP file containing all changes is created. If changes are not reflected in the Playground instance,
  it's possible that the most recent build failed, or has not completed. Check the list of workflow runs to be sure.

For more details about these limitations and more, check out the Limitations page in the WordPress Playground documentation.

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