Don't show plugin version in the 'previous releases' if the release was not confirmed

[dd32]

The 'Previous Versions' on a plugin advanced view can be used to download previous versions of a plugin.

This dropdown is currently working on the assumption that the ZIP file for a given version will exist.

When release confirmation is enabled:

• these ZIPs won't be created for a version, until the version is confirmed.
• In the event that a tag is created, but is never set as the stable tag, the ZIP will also never be created.

The version dropdown should not show plugin versions where the ZIP has not yet been created.

[kraftbj]

In the event that a tag is created, but is never set as the stable tag, the ZIP will also never be created.

This makes smoke testing new releases more difficult. Personally, I like to tag a new version, then wp install [slug] --version=[tag] to test out the plugin before marking it as stable.

This isn't possible, so not possible to smoke test what's offered by w.org and takes a bit more work to svn co or otherwise get the code from w.org to a new site for the sake of a final test.

I believe this issue may also be impacted WP Packagist (which I realize isn't w.org), but I'm thinking they're seeing the tag either via SVN or API and assuming something would be built like non-confirmable plugins.

[dd32]

In 12816:

Plugin Directory: Release Confirmation: Don't display a version in the 'Previous Versions' download form if the version was never confirmed.

Fixes #5902.

[dd32]

This makes smoke testing new releases more difficult.

This was resolved via #5901