ci: auto install deps in frontend and backend dirs of examples before… #1104

Job	Run time
setup	3s
test (./examples/with-one-login-per-subdomain)	4s
test (./examples/with-sign-in-up-split-emailpassword)	7s
test (./examples/with-no-session-on-sign-up-thirdpartyemailpassword)	7s
test (./examples/with-svelte-react-thirdpartyemailpassword)	7s
test (./examples/with-multiple-email-sign-in)	7s
test (./examples/with-phone-password)	8s
test (./examples/with-account-linking)	4m 3s
test (./examples/with-emailverification-then-password-thirdpartyemailpassword)	8s
test (./examples/with-localstorage)	3m 0s
test (./examples/with-i18next)	3s
test (./examples/with-cli-login)	8s
test (./examples/with-emailverification-with-otp)	3s
test (./examples/with-thirdpartyemailpassword-passwordless)	8s
test (./examples/with-emailpassword-vercel)	8s
test (./examples/with-netlify)	7s
test (./examples/with-update-email-post-verification)	3m 27s
test (./examples/with-thirdpartyemailpassword-2fa-passwordless)	4s
	12m 2s

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