fix: save scroll position on exit from video xblock fullscreen mode

[ihor-romaniuk]

This merge request contains a fix for toggling video xblock full-screen mode and saving the previous window top offset position on exit from the full-screen state.

A related bug was found here https://bugs.chromium.org/p/chromium/issues/detail?id=142427 but it still reproduces.

Realised solution: Save the scroll position before the turn on the fullscreen mode and scroll to the previous position on turn off the fullscreen mode.

Dependent PR to MFE Learning:
This MR openedx/edx-platform#31871 must be merged with this MR.

All general discussion and addition information there: openedx/platform-roadmap#229

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (open-release/olive.master@5dab087). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

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[jmakowski1123]

Thanks for mentioning the main Feature Ticket in the description, @ihor-romaniuk !
@mphilbrick211 This is another PR related to openedx/platform-roadmap#229

[ihor-romaniuk]

Hi @itsjeyd. Sorry for delay. Tests were updated and it's ready for review.

[itsjeyd]

Thanks @ihor-romaniuk, I posted on the main PR (#983) to get the changes lined up for engineering review.

[itsjeyd]

Note on current status: Main PR has been added to review queue.

[leangseu-edx]

LGTM 👍

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