Update test snapshots for conditional schema prefixing
Ran `pnpm test:update` to regenerate all test snapshots after implementing conditional schema name prefixing. External schemas now use unprefixed names (e.g., "Foo") instead of prefixed names (e.g., "external_Foo") when there are no naming conflicts.
This affects all OpenAPI test snapshots across 2.0.x, 3.0.x, and 3.1.x versions.
Co-authored-by: mrlubos <12529395+mrlubos@users.noreply.github.com>