Remove cardano-db-v2 and make cardano-db --backend v2 stable

[turmelclem]

Content

This PR includes...

• Make cardano-db --backend v2 stable
• Remove command cardano-db-v2 and use cardano-db --backend v2 instead in in CI and e2e tests
• use cardano-db --backend v1 instead of default backend version in CI and e2e tests
• rework some print for cardano-db download and verify commands

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • CHANGELOG file is updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
  • All check jobs of the CI have succeeded
  • Self-reviewed the diff
  • Useful pull request description
  • Reviewer requested
• Documentation
  • Update README file (if relevant)
  • Update documentation website (if relevant)
  • Add dev blog post (if relevant)
  • Add ADR blog post or Dev ADR entry (if relevant)
  • No new TODOs introduced

Relate to #2577

[github-actions]

Test Results

    3 files  ±0    102 suites  ±0   16m 18s ⏱️ -24s
2 035 tests  - 1  2 035 ✅  - 1  0 💤 ±0  0 ❌ ±0 
4 206 runs   - 3  4 206 ✅  - 3  0 💤 ±0  0 ❌ ±0 

Results for commit 272ac01. ± Comparison against base commit f28a611.

This pull request removes 1 test.

mithril-client-cli::bin/mithril-client ‑ tests::fail_if_cardano_database_v2_command_is_used_without_unstable_flag

♻️ This comment has been updated with latest results.

[Copilot]

Pull Request Overview

This PR removes the deprecated cardano-db-v2 commands and consolidates backend handling so that the stable cardano-db command accepts a --backend option (v1 or v2). Key changes include:

• Updating CLI command construction to always include an explicit --backend option.
• Removing the cardano-db-v2 modules, tests, and documentation references.
• Revising user-facing messages and CI workflows to reflect the new command usage.

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
mithril-test-lab/mithril-end-to-end/src/mithril/client.rs	Adjusts argument composition to include explicit backend flags.
mithril-client-cli/src/main.rs	Removes deprecated cardano-db-v2 commands and associated tests.
mithril-client-cli/src/commands/cardano_db/{show, list, verify, download, mod.rs}	Updates command implementations to use the unified --backend option.
docs/website/root/manual/**/*	Revises documentation to eliminate references to cardano-db-v2.
.github/workflows/test-client.yml	Updates CI commands to use the new --backend flags and removes --unstable.

Comments suppressed due to low confidence (5)

mithril-test-lab/mithril-end-to-end/src/mithril/client.rs:225

• Ensure that replacing the '--unstable' flag with the explicit '--backend' option is compatible with all client use cases and that any clients relying on the old flag semantics are updated accordingly.

                cmd.cli_arg(),

mithril-client-cli/src/main.rs:205

• Confirm that all documentation and error messages referencing the old cardano-db-v2 command are removed or updated to prevent user confusion.

    CardanoStakeDistribution(CardanoStakeDistributionCommands),

mithril-client-cli/src/commands/cardano_db/verify.rs:170

• Ensure that the simplified verification message is consistent with similar messages in other modules, so users receive a unified experience.

            println!("Cardano database snapshot '{snapshot_hash}' archives have been successfully verified. Immutable files have been successfully checked with Mithril.");

docs/website/root/manual/getting-started/bootstrap-cardano-node.md:478

• [nitpick] Verify that this updated message matches the output of the CLI across all similar commands in order to ensure consistency.

Cardano db 'a1b5e6f43521fd9c5f55e3d6bf27dc4a62f43980681cb67e28cc40582a0d1974' has been unpacked and successfully checked with Mithril.

.github/workflows/test-client.yml:256

• Double-check that all CI workflow steps consistently reference the updated '--backend' flag and have no residual usage of the '--unstable' flag.

        run: ./mithril-client --origin-tag CI cardano-db snapshot show --backend v2 $CARDANO_DATABASE_V2_SNAPSHOT_HASH

[jpraynaud]

LGTM 👍

[Alenar]

LGTM