Multiple Audio and/or Video playlists at the same page issue.

[vipul0425]

https://core.trac.wordpress.org/ticket/63583

Moved the script loading logic to occur after validating that the playlist has valid attachments. This ensures scripts are only loaded for the first valid playlist on the page rather than the first playlist attempt.

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[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 60678
GitHub commit: f40b60d

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.