fix(web): image preload and cancelation #12765
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This is the beginning of a multi-part set of PRs, each of which will stand on its own, mostly because it will be easier to review, and understand smaller changes, and its generally a best practice.
In this PR, the base functionality for image preload and cancelation is fixed, previously broken in #9684.
Additionally, video loads can also be canceled while they are still being buffered by pausing the video, and clearing the src attribute.
Also, the memory-lane component has been retrofitted to use image-thumbnail instead of bare images. In general, all thumbnails should be loaded via the image-thumbnail (or thumbnail) components.
The main part of this PR is the introduction of an image-manager component - it orchestrates the loading/cancelation of images.
A future PR will ensure that all images are loaded via the image-manager component.