feat: adding ignore path for pr tests

[stepanLav]

That PR:

• separate lint run and unit test run in order to start testing early (previous it runs only after linting)
• Fail run if coverage lover than 50%, setup in jest.config file, current is:

coverageThreshold: {
    global: {
      branches: 50,
      functions: 50,
      lines: 50,
      statements: 50,
    },
  },

• Added to exclude path for tests:
  '/src/renderer/entities/./ui',
  '/src/renderer/features/./ui',
  '/tests/',

Tested by:
failed - https://github.com/novasamatech/nova-spektr/actions/runs/7347678612/job/20004505820?pr=1347

success - https://github.com/novasamatech/nova-spektr/actions/runs/7347590966/job/20004275829

Can't merge on failure:

[github-actions]

Jest Unit tests results

Duration: 75.401 seconds

Start:	2023-12-28 12:48:20.700 UTC
Finish:	2023-12-28 12:49:36.101 UTC
Duration:	75.401 seconds

Outcome: Passed | Total Tests: 395 | Passed: 393 | Failed: 0

Total Test Suites:	134
Total Tests:	395
Failed Test Suites:	0
Failed Tests:	0
Passed Test Suites:	133
Passed Tests:	393
Pending Test Suites:	1
Pending Tests:	2