Bug 1933776 [wpt PR 49403] - Add a javascript: URL navigation test which checks the parent's snapshotted CSP is checked during task creation, not during task execution, a=testonly

Automatic update from web-platform-tests
Add a `javascript:` URL navigation test which checks the parent's snapshotted CSP is checked during task creation, not during task execution (#49403)

Preparation for fixing <whatwg/html#4651>.
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wpt-commits: 4d2142460b93bbc38274c950e04108ec2770a65f
wpt-pr: 49403

UltraBlame original commit: 6b3c16be2a50b7d3e1a3b839c22bd7345780ebba

Author: marco-c