Eliminate aggressive normalization of meta/link tags for parser tests
- <meta>/<link> tags are being aggressively stripped while comparing parser test results. This can hide bugs in code as is revealed by the changed parser test output and blacklisted wt2html test (T104363, T104502).
- I moved the <meta>/<link> normalization to the non-parsoid path. For the parsoid-only path, I only strip <nowiki/> mw:Placeholder meta tags.
- Had to adjust parser tests output for several tests.
- This affects roundtrip testing error classification as well, but I'll deal with that in a later patch.