Check if stake addresses in proposals are registered onchain

[CarlosLopezDeLara]

Changelog

- description: |
    `transaction build` now checks and fails if stake addresses used for deposit return or treasury withdrawals in proposals are NOT registered on-chain. 
# uncomment types applicable to the change:
  type:
   - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

Resolves #900

How to trust this PR

Tested locally with a Treasury Withdrawal action where neither the deposit return or funds receiving stake addresses are registered:

cardano-cli conway governance action create-treasury-withdrawal \
--testnet \
--governance-action-deposit 50000000000 \
--deposit-return-stake-verification-key-file example/utxo-keys/stake4.vkey \
--anchor-url https://tinyurl.com/3wrwb2as \
--anchor-data-hash 52e69500a92d80f2126c836a4903dc582006709f004cf7a28ed648f732dff8d2 \
--funds-receiving-stake-verification-key-file example/utxo-keys/stake5.vkey \
--transfer 50000000000 \
--constitution-script-hash fa24fb305126805cf2164c161d852a0e7330cf988f1fe558cf7d4a64 \
--out-file example/transactions/pparams-glt.action

cardano-cli conway transaction build \
--proposal-script-file guardrailscriptV2/guardrail-script.plutus \
--tx-in-collateral 90f53aca87f96e0e8660b7dbb71e79845e946a13966cdab382627e73a49dd602#3 \
--proposal-redeemer-value '{}' \
--tx-in 8e1885bb321b50bc0fba00784385e4edfc6a1fe15a6c6d0f1cbc4559dcc67f25#0 \
--change-address addr_test1qr32awchqmdy7l4qlwv5dn7gj2zkhrpzgh7rjapn23ve3a7l4827fjh037jakg39ez4465ywcwcmjq5hvm7r57g7f5fs4dqm47 \
--proposal-file example/transactions/pparams-glt.action \
--out-file example/transactions/pparams-cm-tx.raw

Command failed: transaction build  Error: One or more stake addresses in proposals is not registered: fromList [StakeCredentialByKey "139622a9b18cba6e408a8778be3c35e2e0182b0a3bde695de8d1579e",StakeCredentialByKey "a75e7935011d9228c89ea8ba4587ee0c13663c58500e360be8efe6ce"]

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details.
• Self-reviewed the diff

[smelc]

As I said during the pair programming session, I don't like pattern matching in list comprehensions generally speaking. But in this case, it would be way more verbose to do differently, so I'm fine with this version.