Wallet on ramp providers for native assets

[SergeyZhukovsky]

Description

We currently allow to buy native network assets even though on ramp provider doesn't support it.

Steps to reproduce

1. Set a locale to US so Sardine provider could be seen.
2. Create a wallet and go to a Buy flow.
3. Pick a Binance Smart Chain Mainnet and BNB as an asset to buy.
4. Press Buy button.

Actual result

Observe Ramp.Network, Sardine and Transak there.

Expected result

Only Ramp.Network and Transak should be there as you can't buy BNB via Sardine.

Issue reproduces how often

Always

Version/Channel Information:

• Can you reproduce this issue with the current Play Store version? No
• Can you reproduce this issue with the current Play Store Beta version? Yes
• Can you reproduce this issue with the current Play Store Nightly version? Yes

Device details

• Install type (ARM, x86):
• Device type (Phone, Tablet, Phablet):
• Android version:

Brave version

1.51.x

Website problems only

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Additional information

[kjozwiak]

The above requires 1.50.106 or higher for 1.50.x verification 👍

[srirambv]

Verification passed on the following devices running 1.50.107 x64 beta build

• Verified steps from issue description
• Verified Sardine is not shown for Binance Smart Chain and only shows Ramp.network and Transak

Oppo Reno 5 (Android 13)	Lenovo Tab (Android 12)
29248-ARM.mp4	29248-Tab.mp4