Payment Method Improvements] Suggested changes from previous PR

[backwardstruck]

Closes: #11592 and #11619

Description

Suggested changes from previous PR

This PR addresses several improvements and fixes:

1. WCOutlinedTypedTextField Usage: Updated to use WCOutlinedTypedTextField similar to OrderCreateEditProductDiscountScreen.
2. Text Color Fix in Dark Mode: Addressed the issue where text color in dark mode was incorrect; ensured it appears white.
3. Scrollable Screen: Ensured that the screen is scrollable so users can reach the bottom even when the keyboard is open.
4. Consistent Background: Made the background consistent with the rest of the application screens.
   Ticket here.

Testing instructions

1. Enable OTHER_PAYMENT_METHODS

2. Navigate to the payment method selection screen by selecting Cash for an order that needs to be paid.

3. Verify Text Field and Dark Mode:

   • Check the WCOutlinedTypedTextField functionality.
   • Ensure that the text color is white when in dark mode.

4. Scroll Functionality:

   • Open the keyboard on the payment method screen and ensure that the screen is scrollable.

5. Background Consistency:

   • Verify that the background of the payment method screen is consistent with other screens.

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Flavor	Jalapeno
	Build Type	Debug
	Commit	e8b4d71
	Direct Download	woocommerce-prototype-build-pr11593-e8b4d71.apk

[backwardstruck]

FYI @kidinov I created a separate ticket for the background theming (but that should now be fixed in this PR anyway):
#11619

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 18.9. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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[kidinov]

LGTM!