WS-SKIP-RATE-PV [10%] - Create Skip-Rate & Completion Rate metrics for Portrait Video [DNM]

[pvaliani]

Resolves JIRA: N/A - 10% Project

Summary

• Creates new completion rate and skip rate metrics to be sent to Reverb for Portrait Video Carousels
• Adds video SessionExitReason logic to provide context on how the user exits the player:

navigation: the user moved from one video to another
autoplay-end: the current video finished and the player automatically moved to the next one
playlist-sync: the player loaded a different video than the one we thought was active, so tracking caught up
close-button: the user closed the modal using the close button (the external Simorgh close in Desktop view only)
backdrop: the user closed the modal by clicking/tapping outside the video area
escape: the user pressed the Esc key to close the modal
fullscreen-exit: the player exited fullscreen and that closed the modal.
unmount: the modal/component disappeared and we sent a fallback event during cleanup

Code changes

• Routes eventGroupingName from sendEventBeacon through to useSwipeTracker so that skip/completion rate events are grouped correctly in Reverb while the item and group tracker payload carries the actual analytics context

Testing

1. List the steps required to test this PR.

• Need to figure out what happens when a user skips a section of video and plays to the end? the completion rate currently is still 1

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