Cardano Updates

Rename governance command groups in clusterlib

Upgrade cardano-clusterlib from version 0.7.8 to 0.8.0 in both
pyproject.toml and poetry.lock.

Replaces all usages of `g_conway_governance` with `g_governance` across
tests and utility modules. The Conway governance is now THE governance.

Switch all MIR certificate generation in tests to use
the renamed `g_legacy_governance` instead of `g_governance`.

refactor(staking): remove MIR reward logic from tests

The MIR (Move Instantaneous Rewards) related logic and assertions have
been removed from the staking rewards test. This includes MIR reward
calculations, MIR transaction creation, and related db-sync checks.
The test now focuses solely on standard staking reward flows, improving
clarity and maintainability as MIR is not applicable for Conway+ eras.

feat(governance): remove pre-Conway SPO poll tests and utils

Remove legacy governance poll tests and related data files, including:
- test_governance.py with all pre-Conway poll test cases
- poll_utils.py with helper functions for poll creation, answering, and verification
- golden_stake_pool.skey and governance_poll.json test data

These files are no longer needed as the governance poll functionality has
been deprecated in favor of the Conway on chain governance.

refactor: remove old update proposal tests

Remove the `test_update_proposals.py` test suite and its associated data
file `cost_models_list.json`, as well as related helper functions
`update_params`, `update_params_build`, and `check_param_proposal` from
the utility modules. These old update proposals are no longer supported
in Conway.

refactor(tests): move negative cost models test to Conway

Moved the negative tests for incompatible Plutus cost models from
`test_update_proposals.py` to `tests_conway/test_pparam_update.py` to
test the updates using the Conway on chain governance.

fix(ci): use 'latest' instead of 'legacy' for genesis hash

Update the node upgrade pytest script to use 'latest' instead of 'legacy'
when calling `cardano-cli genesis hash` for Alonzo and Conway genesis files.

docs(tests): fix a list in a docstring

docs(sync-tests): update sync test links and improve docs

- Updated the mainnet sync test link in `tag_10_2_1.rst` to point to the
  published Google Docs version.
- Refactored `sync_tests.rst` for clarity:
  - Improved introduction and test descriptions.
  - Replaced raw HTML dashboards with a list of published sync test
    result documents for recent cardano-node releases.
  - Added repository link for source code reference.

fix(ci): handle missing report files in results script

Update `.github/create_results.sh` to correctly check for the presence of
JSON report files before proceeding. Separate `mv` commands for `.json`,
`.txt`, and `.properties` files now handle missing files gracefully by
redirecting errors to `/dev/null`. This prevents script failures when
some optional report file types are absent.

chore(ci): add script setup group to Nix smoke workflow

Add the PY_COLORS=1 environment variable to the pytest step in the Nix
GitHub Actions workflow. This ensures that pytest output includes color,
improving readability in CI logs.

Wrap the regression script execution in a GitHub Actions group for improved
log readability. This helps to visually separate the setup and execution
steps in the workflow output, making debugging and review easier.

chore(deps): update vulnerable setuptools to v80.7.1