bug(hvs): missing / modified symbols

[t-bre]

Description

Some symbols were missing after migration from the old separate PCB repos to this new monorepo. The schematic / PCB are fine, but these should be sorted eventually.

Additional Notes

Causes ERC errors below:

[t-bre]

Pretty sure the isolator can just be fixed by the "update symbol from library" button if you double click on the symbol in the schematic.