feat: CP-12572 add function checking, remove but from testnet

[vvava]

Description

CP-12572

Changes

• remove Swap and Buy from testnet mode
• Buy also removed in the legacy app

Testing

Settings -> Testnet mode on -> check the fucntions are not available in the Wallet and Account view

Screenshots:

Checklist for the author

Tick each of them when done or if not applicable.

• I've covered new/modified business logic with Jest test cases.
• I've tested the changes myself before sending it to code review and QA.

[bartosz-the-coder-at-avalabs]

#nit
If buy and swap are disabled, the delay of Bridge animation is quite huge.

It can be solved by this:

let delay = 0
const getDelay = () => delay += 300;

 <Slide direction="left" in timeout={getDelay()} easing="ease-out" />
 <Slide direction="left" in timeout={getDelay()} easing="ease-out" />
 <Slide direction="left" in timeout={getDelay()} easing="ease-out" />
 <Slide direction="left" in timeout={getDelay()} easing="ease-out" />