Add missing feature categories to CI/CD fixture specs

What does this MR do and why?

Adds missing feature_category: RSpec metadata to frontend fixture specs for the Verify stage's Pipeline Execution group.

Part of #584630 (closed)

Changes

File Feature Category
spec/frontend/fixtures/jobs.rb continuous_integration
spec/frontend/fixtures/pipeline_schedules.rb continuous_integration
spec/frontend/fixtures/job_artifacts.rb job_artifacts

Feature categories based on config/feature_categories.yml and Features by Group.

🛠️ with ❤️ at Siemens

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