[electrophysiology_browser] Fix EEG data shift #8999
Merged
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Closes #8892. Has a Loris-MRI counterpart: aces/Loris-MRI#1030
Loosely dependant on #8998 (file modifications in common and done at a later time).
This PR resolves the data shift issue by adding the number of valid samples in the last chunk to the index.json, and using it for the calculations which previously assumed all chunks were filled.
Testing: Zoom in so that the last chunk of the recording is in frame and ensure that the signal does not flatline at the end. You can also compare the values in the chunk payload with the value obtained by hovering the signal at a given time.