Remove navigation API tests that depend on scroll anchoring from Interop 2026

[yulunwu2]

Test List

web-platform-tests/wpt-metadata#9279

Rationale

Remove the following from interop-2026-navigation:

navigation-api/scroll-behavior/after-transition-reload.html
navigation-api/scroll-behavior/manual-scroll-reload.html
These two tests depend on scroll anchoring behavior, which is out of scope for the navigation API focus area.

The equivalent coverage is already labeled for Interop 2026 without that dependency:

navigation-api/scroll-behavior/after-transition-reload-no-scroll-anchoring.html
navigation-api/scroll-behavior/manual-scroll-reload-no-scroll-anchoring.html
These exercise the navigation API relevant behavior without relying on scroll anchoring, so removing the two originals does not reduce what the focus area measures.

[jgraham]

Yes, agreed that we should remove tests that are out of scope.

[nairnandu]

Linked metadata PR is merged.