This pull request updates all test files to use thevitest testing framework instead ofjest. 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 ofjest withvitest in test files, updating usages toexpect andtest fromvitest. (__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 unnecessaryjest.setTimeout calls from all test files, asvitest handles timeouts differently. (All references above)
• Updated test function names fromit totest for consistency withvitest 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 thevitest framework, improving maintainability and consistency.