feat: redesign password authentication flow

[miguelpeixe]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Implements the functional changes for the flow redesign without the UI proposed in #2810:

Sign Up

Sign In

Password

How to test the changes in this Pull Request:

Before testing each flow described below, please make sure you have RAS enabled.

Registration

1. On a fresh session, click to Sign In
2. Click on "Create an account" and confirm the form changes as represented in the image above
3. Enter a new email and submit
4. Confirm you're signed in and redirected to the "My Account" page

OTP authentication

1. On a fresh session, sign in with the same email used to register
2. Confirm you're prompted to enter the OTP code sent to your email
3. Enter the code and confirm you are logged in

Password authentication

1. Once logged in, click to create a password and go through the password creation flow.
2. On a fresh session, enter the same email to login
3. This time, confirm you don't get an OTP and are prompted to enter a password instead
4. Click "Email me a one-time code instead" and confirm you get an OTP code are able to sign in
5. Start another fresh session, use the same email
6. Confirm you are, once again, prompted to enter your password
7. Enter your password and confirm you are authenticated

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[adekbadek]

Works as described, found one small issue.

[matticbot]

🎉 This PR is included in version 3.0.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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[matticbot]

🎉 This PR is included in version 3.1.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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[matticbot]

🎉 This PR is included in version 3.2.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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[matticbot]

🎉 This PR is included in version 3.6.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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[matticbot]

🎉 This PR is included in version 3.9.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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[matticbot]

🎉 This PR is included in version 4.1.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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[matticbot]

🎉 This PR is included in version 4.2.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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[matticbot]

🎉 This PR is included in version 4.4.0-epic-ras-acc.1 🎉

The release is available on GitHub release

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