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.

Change-Id: Ie5d52929980da98bdea3a8042f67352470285de9