Feat#3439/usecolors test coverage

[Evobaso-J]

Create tests for useColor composable

• Add tests to the applyPreset function and the currentPresetName computed
• Refactor of the createTestComposable function (with retro-compatibility) to make multiple composables share state
• Cleanup of unused vars and imports

Description

applyPreset and currentPresetName needed both the useColor and globalConfig composables to share state. This would not be possible by calling applyPreset twice with different arguments: the two composable instances would be on separate app instances. However, the feature was added without breaking changes.
A nice improvement would be adding the proper typing to reap the benefits of autocompletion

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

resolve #3439

[m0ksem]

Looks perfect. Thanks!