Build JIRA Configuration tab (PatternFly)

[itdove]

Description

Create JIRA configuration tab using PatternFly React components.

Tasks

• Create JiraConfigTab component
• Add form fields (URL, project key, comment visibility)
• Implement form validation
• Add "Test Connection" button with loading state
• Display success/error alerts
• Integrate with /api/jira/test-connection endpoint
• Handle field updates and state management
• Add help text for each field

Acceptance Criteria

• All JIRA fields are editable
• Form validation shows errors inline
• Test Connection button validates JIRA URL
• Success/error alerts display appropriately
• Field help text is clear and useful
• Changes are reflected in parent state
• Form follows PatternFly design patterns

Estimated Effort: 3-5 days

[itdove]

Child of #305