Add GitHub Actions workflow for testing and implement new tests

[sigubrat]

This pull request introduces several updates, including the addition of a new GitHub Actions workflow for testing, renaming and refactoring of utility functions, enhancements to test coverage, and the introduction of new test fixtures. Below is a categorized summary of the most important changes:

CI/CD Enhancements:

• Added a new GitHub Actions workflow (.github/workflows/test.yml) to automate testing using Bun, triggered on pushes and pull requests to the main branch.

Code Refactoring:

• Renamed the utility function timestampInSecondsToString to SecondsToString across multiple files for improved readability and consistency. [1] [2] [3] [4] [5] [6] [7]

Test Suite Improvements:

• Added a new test suite for ChartService in src/test/services/ChartServiceSuite.test.ts to verify chart creation functionality.
• Expanded the utilsSuite test suite to include tests for utility functions such as getTopNDamageDealers, sortGuildRaidResultDesc, and SecondsToString.
• Renamed DataTranformationServiceSuit.test.ts to DataTranformationServiceSuite.test.ts and updated its test data and descriptions for clarity.

Test Fixtures:

• Introduced new test fixtures (GuildRaidResultFixture and updated RaidResultFixture) in src/test/testFixtures.ts to support enhanced testing scenarios. [1] [2]

Code Cleanup:

• Removed unnecessary logging and warnings from the getCommands function in src/lib/utils.ts.