test(storage): Run unit tests against MariaDB and MySQL in task workflows and CI

[coderabbitai]

Summary

Run the storage unit-test suite against both MariaDB and MySQL.

Rationale

PR #450 removes MariaDB-specific RETURNING syntax so Spider supports MySQL. The test workflow must validate database behaviour on both supported database engines.

Required changes

• Update the task-based local test workflow to run the relevant unit tests with MariaDB and with MySQL.
• Update CI to run the relevant unit tests with MariaDB and with MySQL.
• Keep database setup and test configuration explicit for each engine.
• Ensure test failures identify the database engine that failed.

Affected areas

• Storage database test configuration.
• Task definitions for unit tests.
• CI workflow definitions that provision database services and run unit tests.

Acceptance criteria

• A developer can run the relevant unit tests through the project task workflow against MariaDB.
• A developer can run the same unit tests through the project task workflow against MySQL.
• CI executes the relevant unit tests against MariaDB and MySQL.
• CI reports failures separately for each database engine.
• The documented test commands and CI configuration remain reproducible.

Backlinks

• Pull request: feat(spider-storage): Add support for MySQL database. #450
• Request comment: feat(spider-storage): Add support for MySQL database. #450 (comment)
• Requested by: @sitaowang1998