[ZEPPELIN-6361] Add E2E tests about Job Manager Page

[devyeony]

What is this PR for?

• This PR adds comprehensive E2E tests for the Job Manager feature using Playwright. The Job Manager is a feature in Zeppelin that allows users to monitor and manage running jobs/notebooks. These tests ensure the Job Manager UI works correctly across different states and user interactions.

What type of PR is it?

Improvement

Todos

• [x] Create Job Manager page object model (JobManagerPage)
• [x] Create Job Card component model (JobCard)
• [x] Create Job Manager utility helper (JobManagerUtil)
• [x] Add system states tests (disabled, loading, success states)
• [x] Add filter controls tests (search, interpreter filter, sort)
• [x] Add job cards tests (display, status, controls)
• [x] Add status legend tests (badge display and counts)

What is the Jira issue?

• ZEPPELIN-6361

How should this be tested?

• Run the Job Manager Playwright E2E tests.

Screenshots (if appropriate)

Questions:

• Does the license files need to update? No
• Is there breaking changes for older versions? No
• Does this needs documentation? No