Change to bulkAdd for snapshot restore

[bjtitus]

Fixes an issue caught in #3718 with the application of the Up Next snapshot.

When we call PlaybackManager.shared.addToUpNext, the ``UpNextButton.episodeAddedis triggered, causing animations to stack up. Instead, we should usebulkAdd` to apply the snapshot so that we don't trigger those animations.

To test

• Create an Up Next queue with hundreds of episodes (>500) by selecting all from various podcasts and adding
• Clear the Up Next queue
• Go to Profile > Settings > Up Next History
• Apply an Up Next history snapshot
• ✅ Ensure episodes are added to Up Next queue and results are applied instantly

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

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[pocketcasts]

Version 8.1 has now entered code-freeze, so the milestone of this PR has been updated to 8.2.

[pocketcasts]

Version 8.2 has now entered code-freeze, so the milestone of this PR has been updated to 8.3.

[pocketcasts]

Version 8.3 has now entered code-freeze, so the milestone of this PR has been updated to 8.4.