Migrate admin_jobs_spec to MSW

What does this MR do and why?

Migrate admin_jobs_spec to MSW

This moves the tests from Capybara/Rails integration tests to MSW compatible ones using GraphQL fixtures

References

• Work item: Migrate `spec/features/admin/admin_jobs_spec.rb... (#632695 - closed)
• Epic to migrate to MSW: Migrate Verify domain Capybara to MSW (#625161)

Screenshots or screen recordings

N/A

Metrics

Current Average (Capybara)	This MR
	11 seconds

Grafana Dashboard link

How to set up and validate locally

1. Generate the fixtures:

bundle exec rspec ee/spec/frontend/fixtures/admin_jobs_integration.rb

2. Run the MSW tests

yarn jest:integration ee/spec/frontend/integration/ci/admin_jobs/admin_jobs_spec.js

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.