[feat] refines the auth flows

[pragyakallanagoudar]

🎋 Description

🌴 What's new in this PR

This PR:

• adds a confirm password input for the signup flow
• provides feedback to the user when they attempt to sign up with an email that is already registered
• adds "new password is not the same as old password" requirement to the reset password PasswordComplexity

🌲 Screenshots

(1) password in confirm password input does not match the original

(2) email for the account already exists

(3) new password is not the same as old password (working on screenshot 🔨)

🌳 How to review

1. Try to sign up for a new account with an email that already exists, and make sure it errors.
2. Try to sign up for a new account with an email that isn't attached to an existing account. Make the confirm password different from the password input, and make sure it errors.
3. Try to reset your password for an account and enter in the existing password again as the new password. Make sure it errors.

🌱 Next steps

1. Did not add the feature that checks if an account with the email exists for the forgot password page. This is non-trivial because we can't access all the emails in the auth table, so will need to do more digging on this!
2. For the Log In flow, both the email and password text inputs have error messages that are currently not supported ("Email not found" and "Password is incorrect"). It may be useful to add implement a fix for these messages to be displayed in a future sprint. Note: While these messages are not displayed given this has not been implemented, there is a general error message ("Something went wrong. Please try again.") displayed near the top of the card.

🔗 Relevant Links

ℹ️ Online sources

https://github.com/orgs/supabase/discussions/1282#discussioncomment-5230475

🪴 Related PRs

CC: @varortz

[linear]

IJP-102 Refine the auth flows.

[jinkang-0]

looks good pragya! i just had some minor nits, but otherwise everything looks great - major improvement to the auth flows!

[varortz]

Could we also get rid of the periods for these error messages?

[varortz]

OH also, are you still down to implement these error checks like we had mentioned the other day?

[varortz]

LOOKS AMAZING PRAGYA! THANKS FOR ENHANCING THE AUTH FLOWS :))