next.js

a777ebcf - test: retry waiting for ISR fallback in prefetch-static-shell (#98884)

test: retry waiting for ISR fallback in prefetch-static-shell (#98884) - ISR prerenders can take a moment to propagate in `deploy`, longer than in `start`, so do a retry loop that waits for the fallback to go away before running tests that need it - ISR fallbacks are only upgraded when using adapters, skip the tests that care about those if using legacy deploy bc they'll fail otherwise