removed email support for sign in #2377

Job	Run time
setup	4s
test (./examples/aws/with-emailpassword)	2m 32s
test (./examples/next/with-emailpassword)	1m 36s
test (./examples/loopback/with-emailpassword)	1m 55s
test (./examples/koa/with-emailpassword)	1m 55s
test (./examples/express/with-emailpassword)	6m 22s
test (./examples/cloudflare-workers/with-emailpassword)	6m 24s
test (./examples/cloudflare-workers/with-email-password-hono-be-only)	1m 18s
test (./examples/fastify/with-emailpassword)	1m 36s
test (./examples/nest/with-emailpassword)	2m 7s
test (./examples/hapi/with-emailpassword)	1m 37s
	27m 26s

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