Add PPOM testing section

[seaona]

Description

This PR tackles these 2 needs:

• We need an easy and fast way to manually test the ppom module.
• We need to automate the testcases related to the ppom flows.

For that, a new section on the test dapp has been created, where we can trigger all the possible warnings fired by the ppom module.

Notes for Testing

Bear in mind the following points, in case you want to try the new dapp functionalities:

• at the moment ppom module is only supported on Mainnet, with no other RPCs than Infura, with special Infura Id (ask me if you need it). In the future, support is going to be extended to more RPCs (in the next ppom version) and more networks/chainIds.
• at the moment, ppom module is only available in flask builds (with proper envars setup BLOCKAID_FILE_CDN and BLOCKAID_PUBLIC_KEY)
• you need to activate the functionality under Experimental Settings / Blockaid
• you need to have a small amount of ETH balance for malicious transactions and some amount of BUSD for the ERC20 related ones (once different RPCs are supported, you can easily bypass this by using a Tenderly devnet and seeding your account (see more in the Workshop recording about this topic - Configurable Forks & Contract Storage Manipulation)
• you don't need any balance for Signatures (Malicious Permit/Trade Order/ Seaport)

test-dapp-ppom.mp4

Extra Info

• Fixes https://github.com/MetaMask/MetaMask-planning/issues/1189
• Missing Send ERC721 and SetApprovalForAll cases (will be done in a subsequent PR once current blockers are sorted out)

Screenshots