When rendering snapshot, disregard earlier resources with the same url,
because it's most likely that the latest one was used for rendering.
An example would be reloading the page before the stylesheet has
finished loading. In this case, the stylesheet will be requested twice,
and the second copy that was not aborted should be used for the
snapshot.
Fixes#23709.
For all custom elements defined in the page, we preserve their names and
define them in the rendered snapshot.
This makes things like `:defined` css pseudo work.
Fixes#21030.
fix: sanitize URLs with vbscript:
The vbscript: protocols can be used to run scripts in much the same way as the javascript: protocol. This PR adds in validation for those aforementioned protocols in snapshotterInjected.ts and snapshotRenderer.ts.
