CI: Validate coin configs

[naezith]

GitHub Action does these checks:

• The coins.json and coins_config.json in the Flutter project match the commit with the associated coins_repo_commit hash specified in coins_ci.json.
• For supported coin types, check that all the wallet-only ("wallet_only": true) coins from assets/coins_config.json are listed in the walletOnlyCoins array in lib/app_config/app_config.dart
• Ping all the URLs (regex) in lib/app_config/app_config.dart and ensure that none return a bad HTTP status.

Example:

Notes:

• The response is falsely 404 for the GitHub.com and Discord redirecting links, so they are put in code as exceptions.

[ca333]

plz update target to dev branch @naezith

The base branch was changed.

[naezith]

@ca333 Done. The branch is from add_arrr though so now it's 93 commits instead of 5.