* Update test environments and lint configuration
Update Jest (unit + integration) and Playwright (e2e) test environments. Includes stability improvements for e2e tests using newer, more stable methods per the Playwright docs.
- Update Jest 26 => 27
- Update Jest-related libs (babel parser)
- Update Playwright 1.8 => Playwright Test 1.18
- Update GitHub CI (action versions, job parallelization, and matrices)
- Update ESLint 5 => 8
- Update ESLint-related libs (parser, prettier, Jest, Playwright)
- Fix test failures on M1-based Macs
- Fix e2e stability issues by replacing PW $ method calls
- Fix ESLint errors
- Fix incorrect CI flag on Jest runs (-ci => --ci)
- Refactor e2e test runner from Jest to Playwright Test
- Refactor e2e test files for Playwright Test
- Refactor fix-lint script name to lint:fix for consistency
- Refactor npm scripts order for readability
- Remove unnecessary configs and libs
- Remove example image snapshots
