Sync parserTests with core tests.
This matches upstream core commit 4bff1ccc98b96a88e7bbb744eafecc91ec23c146.
This adds a number of new tests for magic links and free external links
which expose bugs in Parsoid. These will be addressed by
I5ae8435322c78dd1df170d7a3543fff3642759b1 (bug T67278).
There's also a new table-related test ("Build table with pipe as data")
which seems to fail wt2wt, hopefully only due to <nowiki> insertion.