Add support for passing isSignUp as a property in preload checks func… #2100

Job	Run time
setup	3s
test (./examples/with-multiple-email-sign-in)	6h 0m 15s
test (./examples/with-svelte-react-thirdpartyemailpassword)	2m 47s
test (./examples/with-update-email-post-verification)	3m 53s
test (./examples/with-netlify)	3m 41s
test (./examples/with-hash-router)	2m 32s
test (./examples/with-multifactorauth-recovery-codes)	3m 35s
test (./examples/with-legacy-2fa)	3m 31s
test (./examples/with-localstorage)	2m 19s
test (./examples/with-one-login-per-subdomain)	3m 14s
test (./examples/with-emailpassword-vercel)	3m 8s
test (./examples/with-thirdpartyemailpassword-passwordless)	3m 21s
test (./examples/with-sign-in-up-split-emailpassword)	3m 11s
test (./examples/with-account-linking)	3m 53s
test (./examples/with-phone-password)	4m 55s
test (./examples/with-cli-login)	3m 10s
test (./examples/with-emailverification-with-otp)	3m 47s
test (./examples/with-multifactorauth-phone-chooser)	5m 37s
test (./examples/with-no-session-on-sign-up-thirdpartyemailpassword)	3m 8s
test (./examples/with-phone-password-mfa)	4m 51s
test (./examples/with-emailverification-then-password-thirdpartyemailpassword)	3m 11s
test (./examples/with-i18next)	3m 10s
	7h 11m 12s

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