Replace Jest with Vitest

[mikepenz]

This pull request updates all test files to use the vitest testing framework instead of jest. The changes ensure consistency across the test suite and remove unnecessary timeout settings. The most important changes are grouped below:

Test framework migration:

• Replaced all imports of jest with vitest in test files, updating usages to expect and test from vitest. (__tests__/configuration.test.ts [1] __tests__/demo/demo.test.ts [2] __tests__/gitea/releaseNotesBuilderGitea.test.ts [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] __tests__/gitea/releaseNotesBuilderPullGitea.test.ts [18] [19] [20] [21] [22] [23] [24] __tests__/main.test.ts [25] [26] __tests__/offline/offlineMode.test.ts [27] __tests__/regexUtils.test.ts [28] [29] [30] [31]

Test style and cleanup:

• Removed unnecessary jest.setTimeout calls from all test files, as vitest handles timeouts differently. (All references above)
• Updated test function names from it to test for consistency with vitest conventions. (All references above)
• Minor formatting fixes for code style and consistency, such as quote usage and whitespace. (__tests__/main.test.ts [1] [2]

These changes modernize the test suite and make it compatible with the vitest framework, improving maintainability and consistency.

[github-actions]

	Tests	Passed ✅	Skipped	Failed
JUnit Test Report	66 ran	66 passed	0 skipped	0 failed

Test	Result
No test annotations available

• View JUnit Test Report

[Copilot]

Pull Request Overview

This pull request migrates the test framework from Jest to Vitest across the entire test suite. The change modernizes the testing infrastructure by replacing Jest-specific imports and configurations with Vitest equivalents.

Key changes include:

• Replaced all Jest imports with Vitest in test files, updating to use expect and test from Vitest
• Removed Jest timeout configurations (jest.setTimeout) since Vitest handles timeouts differently
• Updated package.json to use Vitest commands and dependencies instead of Jest

Reviewed Changes

Copilot reviewed 14 out of 17 changed files in this pull request and generated 6 comments.

File	Description
package.json	Updated test scripts to use Vitest, replaced Jest dependencies with Vitest, and updated other dev dependencies
eslint.config.mjs	Removed Jest ESLint plugin and Jest globals configuration
All test files	Replaced Jest imports with Vitest, removed timeout configurations, and updated test function syntax

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