webrtc wpt: fix generateCertificates WPT, add one for rejecting SHA-1 and delete legacy tests
- Fixes the two remaining WPT failures for generateCertificate.
- Adds a negative test for SHA-1 for RSA certificates since SHA-1 should not be used for this anymore
- clean up legacy fast/ generateCertificate tests which are superseded by the WPT ones.
BUG=webrtc:364338811
Change-Id: I513434b4084a2852dde7c340c8760640f3e25cb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5863274
Reviewed-by: Henrik Boström hbos@chromium.org
Reviewed-by: Guido Urdaneta guidou@chromium.org
Commit-Queue: Philipp Hancke philipp.hancke@googlemail.com
Cr-Commit-Position: refs/heads/main@{#1355957}