Remove Fraud Protection discoverability banner and modify fraud protection welcome tour trigger

[allie500]

Description

As part of WooPayments version 5.7.0, we included a discoverability banner that would show on the Payments > Overview page. This banner was added in PR #5611. Also as part of the 5.7.0 release we included a welcome tour for the fraud protection settings in PR #5716. Both of these features were behind a feature flag and were later fully released in version 5.9.0.

Currently when a new merchant lands on the Overview page, they will see the banner:

Clicking the learn more button will take the merchant to the Settings page and trigger the welcome tour to run.

In this issue, we want to completely remove the discoverability banner and modify the welcome tour to show the first time a merchant navigates to the Payments > Settings page. All other functionality of the tour should remain the same. If the merchant clicks completely through the tour or hits the X button to close the tour on any tour card, then the wcpay_fraud_protection_welcome_tour_dismissed option should continue to be set so that the tour no longer shows up.

Acceptance Criteria

• The Fraud Protection discoverability banner code and unit test code should be completely removed.
• The Fraud Protection welcome tour should show for new merchants the first time they navigate to the Payments > Settings page.

Dev Notes

This issue was discussed in Slack. Testing instructions are also included in the thread.