Refactor: project structure

[kneerose]

List of changes

• Remove the unnecessary faucet/proposal wallet.
• Use faucet credentials and address from the environment variables to load all test wallets.
• Check the available balance of the faucet address and skip dependent setup and tests if the balance is insufficient.
• Add the project structure and architecture documentation.
• Update the README and developer guide.
• Add cleanup artifacts teardown to remove all JSON files generated during test execution.
• Refactor the dRep registration validation test.
• Use the default test execution deployment URL https://p80-z6b8d2f7a-ze34e4cb2-gtw.z937eb260.rustrocks.fr/ and include it in the manual trigger.
• Fix outcome flaky test due to interscept logic

Added ENV

• FAUCET_PAYMENT_PRIVATE: ${{secrets.FAUCET_PAYMENT_PRIVATE}}
• FAUCET_STAKE_PKH: ${{secrets.FAUCET_STAKE_PKH}}

Removed ENV from integration test

• FAUCET_API_KEY_PREPROD
• FAUCET_API_KEY_SANCHONET
• FAUCET_API_KEY_PREVIEW
• API URL
• PROPOSAL_FAUCET_PAYMENT_PRIVATE
• PROPOSAL_FAUCET_STAKE_PRIVATE
• PROPOSAL_FAUCET_DREP_PRIVATE

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

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